Year of my Mercury outboard engine?

  • Thread starter Thread starter Ralph D
  • Start date Start date
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Ralph D

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I have a 50 hp mercury outbored motor 4 cyl 2 stroke. It says thunderbolt on the front panel, Blue stripe around it and serial # 5746576. also further down it has a # 54935 And a USA address.
Thanks for your time and effort.
 
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