One of our members who worked for OMC said the serial # with the "G" at the beginning means built in Georgia ,Calhoun plant.
He said the transom clamp handles are the commercial version I will take a better photo of them and post.
I got on ebay and found tons of J/E commercial parts catalogs .Notice the design/logo at the top ,same as the cowling. The Johnson Seahorse symbol on the right end looks kinda evil. EDIT
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"Some people want to know how a watch works, others just want to know what time it is"
Robbie Robertson