www.925-1000.com

I just found the cufflink findings for sale on a supplier site with the exact mark so that is def the mark for the findings manufacturer. Samuel Findings is the company and it's in the UK...so I am guessing that whoever made your cufflink setting and used the findings is a UK jeweler.

Have you identified this one yet? I am trying to identify the circle/wheel .925 mark—I have a baltic amber bracelet with the identical mark on the clasp. Since the back of your cufflink setting is marked DG, it makes me suspect that the circle/wheel 925 mark is the mark for whoever manufactured the ...