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A real war bird - unsung far too often.
Looks like a 'Black Cat' paint scheme. Google it. Black PBY's hunting Japanese convoys at night.
When I was a kid, a PBY used to land at our municipal airport in Sault Sainte Marie, MI a couple times a summer for several years running. I remember zooming to the airport on my bicycle after seeing it circle and land. Awesome machine. I don't know if it was some rich guy's flying boat, or a government/business/research airplane.