Sam is correct, it is a Model 7 and not a Model 3. The only difference between the two is the thickness of the blade, with the M3 having a thicker 1/4" blade. And the original poster can measure the blade length easy enough. If it is a Model 7, it will only have a 4"-5" blade length.
These are the kind of finds that all of us dream about! Congrats!
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