How can I tell a Ludwig snare?

P33v3

Member
I found a 1966 metal Ludwig snare. I don't see a seam inside the shell and it has the lever that mutes the head. It has a Keystone Badge and a 307xxx number. Is it a Supraphonic? How can I tell? It is in great shape and is 300 bucks is that a good deal?
 
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