Notgeld (emergency) coins of this era are usually worth 5€-15€, however some rarer ones can be 50€ - 100€s.
Your coin is said to have a mintage of 5000, but isn’t that rare from what I can see. The Funck catalogue is the best reference source for German Notegeld. I don’t have one unfortunately, so can’t give you a definitive answer, so MA shops might be your best bet for a selling price. Oh just found one easily;
https://www.ma-shops.de/helmig/item.php?id=159495
This one is rusty and not very attractive for 15€, the one pictured on the Numista coin page might be priced at 25€. For actual purchased coin prices you could try an eBay search of sold items. Obviously the condition of your example has a baring on the price, and I bet if you find some sold items, they will be 40-50% of the prices above.
Even in Germany Notgeld coins are not that popular as a collection area, I often find many in large lots of coins (I don’t actively collect them, but keep them if I find them), some are catalogued at high prices. But not yours unfortunately, for one reason or another. This might be due to the fact they could only be bothered to design one side and somehow used the mould from the cast of the die as the second reverse die! After all the whole point of minting these coins was due to shortages, and local areas had to do it as cheaply as possible, usually using the cheapest recycled metals - lots of steel, aluminium etc.
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