I would need to see the front to make a final determination, but I am guessing by the looks...
maybe a mid 50's Zimmie... Zimmie was one of the first companies to come out with a plastic plug in the mid 40's. Can you post additional pictures? If it is a Zimmie, w/o the box, you're looking at about a 20 spot in value.
Another possibility is... late 60's Alaskan. Value is $10-$15

Hope this helps!
Downriggin' smile
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"If you are not scratchin bottom, you ain't fishing deep enough!" -DR

Puget Sound Anglers, Gig Harbor Chapter