Found it.
German state of Mecklenburg-Strelitz, 1/24 thaler 1756, listed in the Krause world coin catalogue as KM# A64. Struck in the Neustrelitz mint, where a gentleman by the name of Heinrich Christoph Baumgarten was mint official - HCB are his initials. "MSLM" is abbreviation for "Mecklenburg-Strelitz Landmunze" (Landmunze is German for "state coin").
Here's one from 1760 on CoinArchives.
The curly letters below the crown are "AF", the monogram of the Duke of Mecklenburg-Strelitz at the time,
Adolf Friedrich IV.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis