Those ones are pretty thick, by watch standards, and the teeth aren't the smallest. I think from memory the thickness is about 0.25mm, but I would need to get t

Those ones are pretty thick, by watch standards, and the teeth aren't the smallest. I think from memory the thickness is about 0.25mm, but I would need to get the calipers out when I get home. Accutron is where the really small engineering comes in: https://www.youtube.com/watch?v=XugX5zb1rG8 https://www.youtube.com/watch?v=XugX5zb1rG8 the wheel is about 25mm across (I think) but you can't really see the teeth with the naked eye. (https://www.watchdoctor.biz/accutron/ https://www.watchdoctor.biz/accutron/ has more details) but the level of accuracy and detail needed to machine that far outweighs the stuff that rolex do even now. These index wheels were mass produced, and I still don't know how they did it.