Hello. The coat of arms on the obverse looks like the one of the Archbishopric of Erfurt German State. See this coin as a example: 1 Groschen 1801. However, I couldn't find your coin (which has the value of 1/24 thaler), seems like a difficult one to find in standard catalogs.
Thank you for your attention, I saw all this. I was interested in exactly 1799, I could not find aisles at auctions on the Internet, so I asked for help. Anyone have any specialized catalogs for Erfurt?
tdziemia, thanks a lot. Now I know that my coin is not the only one, but there is no link to the directory where I could find out the circulation of the issue and other data, as well as the rarity of the coin.
That's what the Peus description in the link above said: "scheinbar unediert" (= not yet described in a catalog). As they are a well known auction house I think there won't be a catalog containing this coin yet.
I can't find this coin (or anything else for 1799) in the Erfurt catalog by Roland Gräßler (Die Erfurter Münzprägung des Erzbistums Mainz von 1756 bis 1802). That is a 2003 book, but I also checked the 2018 errata.