1950's? GM Air Conditioner Compressor

Buick Cadillac Chevrolet Oldsmobile Pontiac?

I do not know what this fits but looking at pictures it appears to be mid-50's or later.
The part number is embossed - 5911121. There are also numbers 51GC422
It is made by Frigidaire. Turns freely. Condition unknown

 Bidders outside US are welcome. Please ask for shipping rates.

Other Buick parts available - buicknos.

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Thanks for looking.