These photos were taken at the Naval Museum in Constanta, Romania
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This 37 mm gun was developed by Rheinmetall in 1935 as the 3.7 cm Flugzeugabwehrkanone (FLAK) 18. It was essentially an enlarged version of the 2 cm FlaK 30 firing a 37 mm shell from an L/89 barrel.
CALIBRE: 20 mm
Made in Germany
RANGE: 3.700 m
WEIGHT: 325 kg
It was in the endowment of the destroyers during and after the Second World War.