Hello,
here an early GDR buckle used by the "Grenzpolizei - GP (1946-1952)" / "Deutsche Grenzpolizei" -DGP (1952-1961) - (German) Border Police, which existed between 1946 and 1961.
Deutsche Grenzpolizei – Wikipedia
In contrast to the KVP buckle, it was all silver. Otherwise of the same design.
These buckles are said to have been applied to the fire brigade at a later date.
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