More interesting to me as a historical artifact, both in design:
And in brains
BRAINS!!!
That blurry thing in the middle is not my poor technique this time, that's a vibrating lever of some sort, used to convert the quartz oscillations into the oddly-smooth sweep of the second hand
sadly I never got a wrist shot, but this is not a small piece, i'd estimate 42mm or so, and perhaps 15mm thick
A