Gordian III, AE37 medallion, struck AD 240. 47.82 g. 

IMP GORDIANVS PIVS FELIX AVG, laureate, draped and cuirassed bust right.
MVNIFICENTIA GORDIANI AVG, bird's eye view of the Colosseum, between meta sudans and statue of Fortuna on the left, and temple of Juno on the right, elephant and bull in the arena.

Cohen 166; Mazzini III, 166 (this coin); Gnecchi II 23.
Extremely rare. 
With permission of Numismatica Ars Classica auction 125, Lot 754, June 2021.

Sales history:
From the Mazzini collection.
Münzhandlung 1, lot 1945 (1934) ; Hess-Leu 36, lot 525 (1968); Münzen & Medaillen 66, lot 798 (1984); Num. Fine Arts Quarterly, vol. 29, March 1985, lot 193 and vol. 32, lot 339 (1993); CNG auction 102, lot 1075 (2016).