Well, I finally got around to cleaning my sign. Not a huge difference but it is cleaner and has a nice gloss to it.
I am always amazed at what you can learn from the internet. I remember when I would spend the day in a library researching an object and I was lucky if I could find anything. Now you can access company records, government data bases, etc.
I found out that this is quite an early sign. The US government started registering items in 1870 and the number on this sign represents September 26, 1876. I realize that it doesn't mean the sign is that early but I think it would still be pre 1900. Star plug tobacco was produced by Ligget & Myers of St. Louis, Missouri and the company boasted that it sold 3 times more than any other plug tobacco in the world.
BEFORE
AFTER
1896 ENVELOPE
POCKET TIN
SIGN ON STORE