Yes, I have the marriage license, so OK, a C of E in St. Martins in the Fields. They were business partners of similar age, although I wouldn't be surprised if they were related somehow. Or maybe not. They died in Philadelphia and I have their burial information, but none of the information has their ages. The 1730 date is based on the earliest birth year, assuming that the 1756 marriage was in the (later) prime of life. The guy who married subsequently had 4 children whose dates I found in an old bible record, but nowhere can I find their places of birth. The Catholic Church in the Parish tells me their records are in the process of being digitized so at some point I can search them on ancestry, but not yet. The Catholic Church records in America for that era were lost long ago.
I think they were French based on the French spelling of the first name on the marriage license; the surname of the second guy; the fact they were listed occasionally as "Mons." in American records; and the fact that the guy with the French-ish surname's nephew was absolutely born in France (I have his naturalization papers in Philadelphia.) Unfortunately, I have no idea where in France they originated.
I am looking for any records I can get. And yes, I am being obtuse about their names, for a reason I would like to keep secret for now. If you have any recommendations, I would be appreciative.
The only idea that I haven't followed up on yet is to check the Kent's London Directories from the era, which I won't be able to do until next week.
EDIT: Some of the livery companies' membership records are online and I was able to search them, but they weren't there. It is no guarantee that they were members of a guild, much less one relating to carving or gilding, and the few guilds I contacted separately were unable to help unless I provided them with more information.