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A 75 hp Mercury outboard, serial number OB9655687, I can not find on the serial number chart. One thing I see, is a seven digit serial number, with a OB prefix. The seven digit serial numbers, ( prior to 1985 ), had no prefix. Serial numbers with the prefix, ( OA,OB,OC, ect. ), have six digit serial numbers. Could there be an error in the serial number posted?

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17y ago

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