The Makarov PM was the standard service pistol in the GDR until it collapsed in 1991.
No doubt the Stasi and any other special services used other handguns but the Mak was the only standard issue. After production was complete in 1965 the Ernst Thaelmann factory retained the tooling and a large supply of parts which were later used, circa 1997, to make the Simpson-Suhl Makarovs.