Reply To: Stupid pocket watch tool question…

[peterclare]

I should clarify, and say the jewel in a capped setting pair has a flat bottom (towards the gear) and curved top towards the cap.

If you have a flattish jewel with a reservoir it may be a plain plate jewel, not meant for capping.

There is a good diagram here
en.wikipedia.org/wiki/Jewel_bearing
that might help.

Regards

Peter