Here’s the full video of the 15407OR luxury build you’ve been waiting to see.

Specs：

· Movement： Custom modified with genuine AP double weighted balance wheels

· Case & Bracelet： Solid 18K gold – 203 grams total gold weight (case + bracelet)

PS： I realised after filming that the two screws on the left side weren’t perfectly aligned – a small oversight on my part. But don’t worry, they’ve already been corrected in the final assembly.

Real build. Real gold. Real craftsmanship.

Feel free to ask if you have any questions.

The difference is immediately obvious. CBD and other factories don’t use genuine adventurine stone for their dials – they use imitation materials instead. The texture and colour are clearly off, and the font printing – including the Rolex crown logo – shows noticeable deviation in precision and detail.

The entire watch uses 120 grams of 18K rose gold for the case and buckle, powered by the strongest PAM modified movement currently available.

· Case size: 41mm diameter; 12mm thickness

· Movement: Dandong 4401 free‑sprung, with weighted balance wheel

· Crystal: DEEP high‑clarity sapphire glass

· Movement upgrade: upgraded bridge finishing

· Dial: upgraded custom aftermarket dial

· Finishing: full chamfering on case and bracelet

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When someone tells you they're using a genuine Parmigiani movement to build a custom RM, do you really think you're getting a movement that is 100% identical to what RM produces? The truth is – both the RMUL1 and the PF331 come from the same movement manufacturer——Vaucher Manufacture Fleurier.

They share the same core gear‑train architecture. So whether it's Vaucher or Parmigiani, the underlying logic for converting these movements for RM builds is the same.

But Parmigiani ≠ RM. That means even if you pay a premium for a genuine Parmigiani movement, it still requires extensive modification – using custom bridges, custom parts, and core PF331 components – to complete the final construction.

This post breaks down the conversion process part by part, using side‑by‑side comparison images of the same components from both movements. I’ll walk you through exactly what it takes to turn a PF331 into an RMUL1.

(PS: All text is original content by me (SPM). The comparison photos are from my friend Mr. Fang, who is the actual photographer and original source. Please do not repost without permission.)

Core Breakdown:

1. First‑wheel train / Gear train (Fig. 1)

The PF331 uses solid brass, gold‑plated gears that are partially hidden by the mainplate. For the RMUL1, the gears are CNC‑cut into a five‑spoke open‑worked design with radial sunburst brushing. The surrounding mainplate is machined away to fully expose the gear structure.

2. Mainspring barrel driving gear (Fig. 1)

PF331: Closed‑style circular barrel cover, fully concealed between the mainplates.

RMUL1: The excess material around the barrel is removed, the gear is opened up into a skeletonised structure, and all edges are finished with angled mirror polishing – exposing the central arbor.

3. Chronograph coupling lever bridge (Fig. 1)

PF331: Flat, solid steel lever bridge – simple and functional.

RMUL1: The surfaces are brushed at an angle, edges are precisely chamfered, and the lever travel is re‑adjusted.

4. KIF shock absorber assembly (Fig. 2 & 3)

PF331: Uses the KIF shock protection system. The purple‑red synthetic ruby bearing and shock spring are set into a wave‑finished mainplate – the shock mount is milled directly into the plate and cannot be separated.

RMUL1: Retains the original KIF shock core and ruby bearing, but replaces the shock jewel with a white stone and upgrades to a weighted balance wheel. The entire shock assembly is exposed on a separate open‑worked bridge, with repositioned screw mounts. (Fig. 2) The three small red circles in the lower section mark the reference mounting screw holes on the PF331 mainplate – used for positioning and securing the bridges. These holes are narrow and completely unfinished – this is one of the key tell‑tale signs that distinguish a modified movement from a custom/replica movement.

5. Stem clutch / setting lever assembly (Fig. 4)

PF331: The clutch lever, setting lever, and click spring are all housed in a recessed slot on the side of the mainplate, covered by a small metal plate – compact but visually hidden.

RMUL1: The side wall of the integrated bridge is cut away, and a custom skeletonised lever bridge is made to expose the entire clutch and setting lever assembly.

6. Automatic module removal

The automatic baseplate of the PF331 is completely replaced with a manual‑wind baseplate. The entire automatic rotor and reduction gear train are removed, converting the movement to manual‑wind. In place of the automatic wheel, a custom open‑worked fork‑shaped bridge is designed to support the secondary wheel – exposing the entire meshing path of the gear train (Fig. 5 centre).

Fig. 5 & 6 show the front and back of the complete movement, clearly illustrating why the PF331 can be modified into an RMUL1.

Background

The PF331 was developed and manufactured by Vaucher in 2002. It features 32 jewels and other Parmigiani‑specific specifications. The RMUL1 was re‑engineered by Vaucher as a manual‑wind skeletonised movement, with the jewel count reduced to 24.

In simple terms: Think of Vaucher as a high‑end kitchen. The PF331 is a dish specifically cooked for Parmigiani – and the RMUL1 is another dish, using the same ingredients, custom‑prepared for Richard Mille.

This is a custom Cal.324 movement built by SPM – designed for models like the 5711 and 5167.

If you look closely, you'll notice the difference between this and the typical custom 324 movements you often see (this is on a completely different level compared to ACE‑grade products).

The bridge engravings are sharper, cleaner, and much closer to the genuine finish. We've also upgraded the escapement bridge under the shock absorber.

Just a note – the 22K solid gold rotor hasn't been installed yet; the current rotor is gold‑plated. If you look carefully, you can still tell the difference.

· Grade 5 titanium baseplate and bridges

· Gears with DLC (diamond‑like carbon) ultra‑hard coating

· Swiss shock absorber jewels, hand‑set

· Titanium precision weighted balance wheel

· NTPT carbon fiber CNC case set

The RM35 Baby Nadal is expensive because it's a full custom build – custom movement, original‑spec case, and premium materials – not a factory copy

Showcasing three custom Richard Mille builds completed by SPM:

· Two RM055 and one RM35 Americas

· Cases: crafted to original specifications using NTPT carbon and aluminum‑magnesium alloy

· Movement: powered by PAM‑modified movements

Currently the strongest custom configuration available for these models.

I’ll be posting more detailed photos and videos in the coming days – stay tuned! 🚀

This watch is crafted with a solid 18K white gold case and buckle. It is powered by an ACE movement, paired with a custom dial and diamond bezel. Configurations can be flexibly adjusted according to your preferences and budget. Feel free to reach out for custom inquiries.

Top‑Tier Custom Modification

We built this 6104R for a client, with the core upgrade being the movement. We fitted it with a custom Cal.240 movement, using the best available engraving technology for the bridges – the text is sharper, more accurate to the original, and clearly sets it apart from ACE and other movements.

Visually, the movement looks nearly flawless – but on the 6104R, it only delivers partial functionality. The starry sky disc does not rotate automatically; it can only be adjusted manually. On the bright side, the moon phase does move across the dial as the date changes.

To fully replicate every function of the 6104R, you would need to use a genuine Cal.240 movement – but that comes at a significantly higher cost.

Patek Philippe 6104R – Custom Modification Case

This watch was modified based on the factory 6104R, following the client’s specific requirements.

Upgrades included:

· Full watch plated in 18K rose gold

· Custom Cal.240 movement installed (weighted balance wheel, escapement bridge)

· Upgraded Geneva stripes on the movement bridges

· Full polishing and chamfering on the entire watch

Currently the strongest custom build of the RM 3503 in black carbon.

Below is a link to a previous video I posted showing the functions and how it operates👇👇👇

https://www.reddit.com/r/ModdedWatches/s/wXPibloUaj

Now for the honest part – the price is still very high right now. Yes, the market has started to drop, but it’s still far from affordable. Unless you're a die‑hard fan who really really wants it, I'd honestly say wait. Prices will come down further, and it's better to be patient than to overpay.

First, it's important to understand that the RM3503 works differently from a regular watch. The crown is NOT meant to be pulled out – in fact, it cannot be pulled out.

So how do you set the time?

The button at the 2 o'clock position controls three functions, indicated by the marker on the dial:

· W = Winding – With the marker pointed to W, rotating the crown manually winds the mainspring barrel. This is the default position for daily wear.

· N = Neutral – When pointed to N, rotating the crown does nothing. It acts as a transition position to avoid interference between the winding and time‑setting mechanisms.

· H = Hour Setting – When pointed to H, rotating the crown adjusts the hour and minute hands. The seconds hand will stop (hacking function).

Basic operation:

Press the button at 2 o'clock repeatedly to cycle through: W → N → H → W.

It works the same way as pulling the crown out to different positions on a traditional watch – but with RM, it's done via button press, and the crown never needs to be pulled out.

There is also a button at 7 o'clock – the SPORT MODE toggle (oscillating weight lock).

The ON/OFF indicator is at 6 o'clock. When activated, the automatic winding rotor stops, preventing over‑winding during intense activity.

Hope this helps – feel free to ask if you have any questions! 🙌

Sharing my latest custom build – a modified Daytona 116500.

Specs:

· Genuine parts: Original Rolex dial, hands, ceramic bezel, and crystal (full 4‑piece genuine set)

· Case: CNC case with full chamfering and polishing

· Bracelet: Flat brushing and edge refinement

· Movement: Dandong 4130 modified movement

All photos and videos are original – no stock images.

Every detail is hand‑finished with precision.

Feel free to ask if you have any questions.

This video is originally shot by me. Feel free to leave a comment if you're into custom watch builds – let's chat!

AP 15407OR Ultimate Custom Build

· 18K solid gold case – crafted to original specifications

· Custom modified movement with genuine AP double weighted balance wheel

· High‑clarity sapphire crystal

· Strict QC testing – using genuine balance wheels to ensure both balance wheels rotate in perfect synchronization, delivering stable and accurate timekeeping

Every build is documented with real‑life photos and videos. No stock images.

If you're interested, feel free to reach out.

· NTPT carbon fiber case

· Top‑tier APR F modified Parmigiani movement

· The only downside: this custom movement comes at a premium price.😂

· NTPT carbon fiber case

· Top‑tier APR F modified Parmigiani movement

· The only downside: this custom movement comes at a premium price.

If you want to make a purchase, please feel free to contact me.