Kempten 1516 with title of Karl /Charles V.

Hi, this silver coin from Kempten has the portrait and title of Charles V of Habsburg who became Holy Roman Emperor in 1519. The weight is 11.05 grams so it doesn't correspond to a half or third thaler weight. I can't find any information about this coin anywhere on the internet, on Numista, or by searching public sales records on Numisbids/Sixbid. Can someone help to identify it?!

The description, legend and date matches MB 18: https://www.ngccoin.com/price-guide/world/german-states-kempten-1-3-thaler-1-3-guldener-mb-18-1516-cuid-178465-duid-399431. As you mention, your coin is overweight, but apparently this type was also struck on thicker flans.