Friends, I snapped some pics of the "Fiddian" lock once I disassembled it recently. As I was comparing the pieces, I soon noticed that a "common marking" was shared among most of the parts.
This stamping, which looks sort of like a crow's foot pattern, looks like three lines struck in this manner: \|/
Parts that bear this marking include the lock plate on it's bottom edge, the flint cock in the inside flat area ahead of the flint, the bridle, tumbler, frizzen spring (minus roller), and sear lever.
Here are some pictures to show this:
I'd sure like to hear from anyone who might know what these markings indicate. I bet these are some sort of lockmaker's or manufacturer's acceptance stamps.
This lock is likely a Birmingham export, and with the later-version frizzen spring with roller bearing (now missing) I have been told it probably was made no earlier than 1800, maybe as late as 1820.
Thanks for any ideas!
Adam