Very rare! Silver denga of Duke Ivan Vladimirovich (1378 - 1430), Duchy of Prons

Description

Tamga / Tamga in shape of ram's head. 16mm, 1.14g. Mint of Pronsk. Cf. Huletsky/Petrunin/Fishman 2298var. (anonymous); Zeno online #28669.
Overstruck over a Golden Horde host coin (AR dang/dirham).
Very rare. A. V. Oreshnikov and than A.A. Ilyin suggested that the coin should be belonged to Ivan Vladimirovich Pronsky when he ruled Pronsk and Ryazan in 1408.