Like Willie said, the stamp says "сестрорецкий оружейный завод" or Sestroyetsk Weapon Factory. It was built during the time of Peter I in 1724 and still in operation, except now it's called Sestroyetsk Instruments Factory and it looks like it's in the process of being relocated. A lot of famous Russian weapon creators, like Mosin, Degtyaryov, Tokarev and Fedorov worked there.
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A suggestion, you might want to edit the title to include "Russian" language.
Anyway it's Sestroryetsk Arsenal near St. Petersburg, Russia.
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Like Willie said, the stamp says "сестрорецкий оружейный завод" or Sestroyetsk Weapon Factory. It was built during the time of Peter I in 1724 and still in operation, except now it's called Sestroyetsk Instruments Factory and it looks like it's in the process of being relocated. A lot of famous Russian weapon creators, like Mosin, Degtyaryov, Tokarev and Fedorov worked there.
Here's a detailed WIki page about it:
https://ru.wikipedia.org/wiki/Сестрорецкий_инструментальный_завод
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