The serial number tag is located on the SWIVEL BRACKET (port or starboard); or, check the INSTRUCTION PLATE, Found amongst the thumb screws above the steering tube. This document is made up of many of Yamaha's valuable trademarks. It may also consist of trademarks belonging to other companies. Any references https://ebay-outboard-motors-yama62726.articlesblogger.com/59206759/how-much-you-need-to-expect-you-ll-pay-for-a-good-ingman-marine-used-boats