What model is this old MM guitar?

I am by no means an expert but all MM guitars have the 4/2 headstock, this has got to be a pile of cr%p with a Musicman sticker on surely.
 
Yeah, that was my firsts thoughts originally...but then I learned that the very early MM guitars actually did have heads like this one, and not the signature 4-2 they always use today. So I started wondering..
 
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