This was in a recent eBay auction and didn't sell. The seller didn't know what it was except that it is a watchmakers tool. This one is Swiss made. I know I have seen a picture of a similar one but can't member what it's used for.

Bob

Possibly for tightening cannon pinions?

Regards,
Bob

Bob, that was my first thought. I was hoping someone who had used one like this could verify that.

Bob

I just came across your posting, did you buy it?

Roddy, I didn't buy it and no one else did on the first listing. It did sell with one bidder the second time it was listed.
Bob

Too bad, it was a Bergeon Cannon Pinion Tightener.
Check your email...
Rod