The serial number tag is found about the SWIVEL BRACKET (port or starboard); or, check the INSTRUCTION PLATE, Found between the thumb screws above the steering tube. This doc has many of Yamaha's precious trademarks. It may consist of trademarks belonging to other companies. Any references to other companies or https://emilianojhari.madmouseblog.com/17476057/yamaha-250-outboard-top-seal-for-lower-unit-an-overview