Hi,
Initials are
ДС (DS)
Likely
SMIRNOV Dmitry Lukich. Mentioned in 1905-1917.
The mark ``worker and hammer`` has been used since 1927.That`s only 10 years after the silvermith was mentioned.Hellenic letter delta is for Moscow assay office.
Some of them obviously continued to work but the production was adjusted to new ideas (compare with porcelain propaganda plates made by Imperial Porcelain Factory, as well as suprematist decor).
I have no records of nationalized workshops and artels, but they did continue with production after the revolution.
Regards
