Here is a link with more info: https://24carat.co.uk/frame.php?url=1937coronationmedalliongoldlarge.php The one I have weighs 15.3 grams and measures about 32mm Diameter. Condition (to me) is UNC-MS and I am pretty sure is is silver.
A couple I pulled from LCS junk box last winter 1861 A & 1862 A German States Anhault-Bernburg 1/6 Thaler .521 silver