Was diggin' around in a box and found this plug
wrapped in paper. No markings on it, 5.5" inches,
aromatic plastic smell...just curious if any old timers
know the identity of the plug?

not positive but i think that is called an alaskan, plug? have a few my self from way back, i have the orangish colored with the silver prisem paper inside.

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'

Here is the lip of the above plug...plus a couple of other plugs
I dug out. The Lucky Louies are wood and the Alaskan appears
to be stainless.