I think you're right it's a joke token. I don't see the silver percentage written any where on it. Plus it says "Japan" in the corner. I'm fairly new to coin collection. I'm going through an old box to see if any thing is worth keeping.
It is an advertising token for the "Lincoln's 10,000 Silver Dollar Bar" in Haugan, Montana. Not to be confused with "Lincolns 50,000 Silver Dollar Bar" which has replaced it under the ownership of the 4th generation of Lincolns to own the bar. Great travel stop if you are ever on I-90 going through Mont ANA
"Suppose you were an idiot, and suppose you were a member of Congress. But I repeat myself." -Mark Twain
If you are unsure of whether it contains any silver, you can always do a drop test. If it makes that distinctive ping sound, then it may be worth it's weight in silver. If it drops with a thud, then it probably contains no silver. That doesn't mean it is worthless. Some tokens are highly collectable, there might be a market for these. I would suggest doing a search of completed auctions on eBay.