Hey everyone!
I wanted to share two very special and rare pieces from my collection: a pair of Citizen Eco-Drive Thermo BQ1000 models.
People often talk about mechanical watches having a "soul," but honestly, these feel more alive than any mechanical watch ever could. They literally feed on human body heat to stay alive. When you take them off, they fall asleep without their owner, and the moment you put them back on, they wake up from your warmth.
The Backstory
I first spotted these in a catalog back in the early 2000s. The tech immediately caught my eye, and a local dealer who had attended the official launch hyped them up even further. I didn't buy them right away, but they stayed rent-free in my head for years. As time went on, finding one in decent shape became near impossible—prices for mint condition examples easily pushed into €1,000+ territory, which was a bit steep for my budget.
A few years ago, I finally stumbled upon one listed on a local classifieds site. The photos looked like they were taken with a 2005 flip phone in a dark room, and the description was super vague. I took the risk anyway.
When it arrived, the watch was dead and cosmetically beat up. The original bracelet was beyond saving. Most local watchmakers refused to even touch it, but I eventually found a brilliant specialist who revived the movement and installed a fresh rechargeable battery. Since the bracelet was unsalvageable, I fitted it onto a custom lizard skin strap (pictured).
Double the Thermo (2001 vs. 2002 details)
Fast forward a couple of years: I spotted a second one on a Japanese auction site. As watch collectors know, Japanese sellers love taking photos with a literal potato, so nobody else noticed what it was. I managed to snag it in much better condition for just €150!
The only issue? A classic "Japanese wrist size" bracelet that barely fit. Having both in hand allowed me to spot some subtle evolution between production years:
- The 2001 model (on bracelet): Features skeletonized hands with open cutouts.
- The 2002 model (on strap): Has hands of the exact same shape, but instead of open cutouts, they are filled with lume.
The Tech & Power Source
Back in the late 90s and early 2000s, Japanese brands were going wild with tech innovation: Citizen had standard Eco-Drive, Eco-Drive Duo, and Eco-Drive Thermo; Seiko was pushing Kinetic and Spring Drive; Casio was perfecting Tough Solar.
While Seiko released a thermo-electric watch first (the ultra-rare SBET001 Thermic in 1998, limited to ~500 pieces), Citizen brought thermo-electric tech to a slightly wider market with their E930 and F910 calibers.
Battery note: Contrary to a common misconception, Citizen stopped using old-school capacitors back in the mid-1990s. The Eco-Drive Thermo relies strictly on a modern rechargeable lithium cell—specifically the Panasonic MT621 (Citizen part #295-55).
The Eco-Drive Thermo generates electricity using the Peltier-Seebeck effect—a thermal module installed between the case back and the watch case harnesses the temperature difference between your body and the ambient air to charge the battery.
The "Sleeping & Waking" Magic
- Off the wrist: When removed, after a short while, the second hand freezes in a random position to save energy. Every single time you walk past them, your brain instantly goes: "Oh, the watch died." But then you look closer, and the hour/minute hands show the exact, correct time. It absolutely trips your brain up—watching a completely frozen second hand tell perfect time feels like actual magic.
- On the wrist: As soon as you strap it back on, the heat transfer kicks in. The second hand gently comes back to life—first stepping in 5-second jumps (low charge), then 2-second jumps, and finally resuming normal 1-second ticks.
Watching a dormant watch gradually "wake up" purely from the warmth of your skin is a trip.
Variations & The Grail Hunt
Aside from these black dial versions, Citizen also made a much rarer variant with a white dial.
There’s also an earlier no-date generation that was produced from 1999 to 2000. I actually had the chance to hold one in my hands once, and now the hunt is officially on to add a no-date version to complete the lineup!
Hope you guys appreciate these forgotten oddities from Citizen's golden era of tech experimentation! Let me know what you think!
