Postby Qrt.S » Tue Mar 13, 2012 1:06 pm
The best I can come up with are these two prospects:
1. Pjotr Jegorovitsh Filippov who had a workshop ~1912 on Kazanskaja Uliza 8 in StP. He also marked ПЕФ.
2. Pjotr Aleksandrovitsh Fokin, a merchant of 2nd order and a goldsmith. Mentioned in early 20th century in St Petersburg. He also marked ПÐФ.
If I had to chose, I'd pick number 1, but who knows?