Hi Rosa,

Thank you for contacting Mearto with your appraisal inquiry.

This "4 Thalers" coin is a denomination of silver currency used in the Holy Roman Empire and Prussia, with the name derived from the Joachimsthaler, the first thalers minted in Joachimsthal. Specifically, the 4 Thalers of Augustus II (1579-1666), Duke of Brunswick-Wolfenbüttel, was a large silver coin issued during his rule, and featured his portrait and relevant heraldry.

I'm not able to find a reliable source for how many of these were minted, or how many have survived, but a 1/4-thaler from this period was retail priced for £1,100. I'd need to double check with a colleague who a numismatics expert but provisionally, this would have a fair market (akin to wholesale) value of $8,000-12,000.

Based on the photos and information provided, and subject to examination, this is:

A 1666 silver August II four-thalers silver coin
Minted in Zellerfeld (modern-day Clausthal-Zellerfeld), Germany
Obverse: Head to the right; Script: Latin; Lettering: FAUSTUM IUSTITAE ET PACIS CONSORTIUM AUGUSTUS D G DUX BR ET LUNE
Reverse: Coat of arms; Script: Latin; Lettering: 1666, ALLES MIT BEDACHT AETAT LXXXVIII NATA ***
Weight: 114.65 g
Diameter: 3-1/2 inches
CONDITION: Ungraded, with some losses but generally appears to be in reasonably fair condition
PROVENANCE: Acquired in an online auction
$8,000-12,000*
*represents a fair-market value for auction purposes; retail or asking price may vary.

Please let us know if you have additional items to appraise, or questions/concerns, and thank you again for using Mearto.
~ Delia