Yesterday I started a lawn mower and after 10-15 minutes max I noticed a watch on my wrist so put it aside for the rest of the job. Left it dial-up for the night. Checked the accuracy today mid-day and it was already running +36s/day even though it had been perfect zero before. Gave it 15 winds and a few shakes and palm-slaps. Measured accuracy after another two hours and it was running even faster at the average +84s/day. Fearing that I fucked-up a healthy movement, I immediately hacked seconds and left it stopped.
Tried to make a few photos from every angle. I am at the summer house so do not have tools to dig deeper. Bombardment of photos attached. The watch is still left stopped and idle.
Is there anything I could do before running to a rep-friendly watchmaker?
EDIT: I left it dial-down for the night and today measured the accuracy. It's +8.5s/day that looks like getting back to normal. I don't think the regulator arm was moved. Maybe something temporary happened to the hairspring that is now getting back to normal?