One factory original complete power head crankcase assembly complete all parts shown cleaned inspected and compression tested in good condition fresh water used. Taken from a Mercury Mark 10A 1959 outboard motor serial number 1120882. Will fit other vintage mercury Mark 10, 10A, 15A, 28, 28A, 28AD  motors check for your compatibility. Take a close look at the photos zoom in the powerhead you see is the one you will get. 
Thanks 

GC Marine Salvage Part Rating 

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