Serial Number 1506:

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This D-44 was Polish made in 1956.

Modernized in the 1970's with the addition of an electrical system and lights, it was referred to as a D-44M for modernized. 

Still in use in a few countries and has been observed in Ukraine. 

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Very nice original condition obtained directly from the Polish government in 2015.  Ukraine subsequently bought the remaining cannons they have been observed in use.