@Orielensis This while not a bracteate like yours, is also uniface but with a date (14)91. The image is upside down. It is a uniface Scherf from Erfurt, a German town. Only 2-3 known.
Remarkable, @tibor. Do you have a pic of the reverse? As high as the relief is, I'm picturing 'ghosting' that might be reminiscent of bracteates, at least.
An interesting coin! I very much like your focus on early dated coinage. I'd call your coin a bracteate, though. The term "bracteate" mainly refers to the technique of striking high-relief, uniface coins from very thin planchets. In high medieval central Europe, many mints produced just a single type of coin without having different denominations. Thus, technical descriptions like "bracteate" or "dickpfennig" are often used instead of just calling these coins a "regional pfennig." "Scherf," on the other hand, is a name for a specific late medieval denomination (half of a pfennig). Here are some more early modern coins that technically are bracteates but have their own denomination names: Cologne, City, BI heller ("möhrchen"), ca. 1676–1677 AD. Obv: three crowns (arms of Cologne) above line and tendril. Rev: negative design (bracteate). 11mm, 0.15g. Ref: Noss 486. Kamenz, City, CU "kipperpfennig", 1622 AD. Obv: eagle's wing with clover, value number "I". Rev: negative design (bracteate). 12mm, 0.16g. Ref: Slg. Merseburger 2753; Rahnenführer/Krug 271. Basel, City and Canton, AR "rappen," 17th c. Obv: crosier ("Baselstab") in shield with three v-shaped ornaments; all in dotted border. Rev: negative design (bracteate). 17.5 mm, 0.27g. Ref: HMZ 2–89a.
