CONCORDIA AVGG

Bust of Tranquillina to the right, diademed, draped and set on crescent.

Gordian III standing left and clasping hands with Tranquillina standing on the right. Gordian III holding a scroll with his left hand.

Photo of a coin sold the ? by Classical Numismatic Group in their webshop, link to the sale: https://www.acsearch.info/search.html?id=38754, link to their website: https://www.cngcoins.com/.

Cohen n°9 reports a reverse PIETAS AVG which need confirmation. Source: Catalog of a collection of silver medals, Paris, 1811, having belonged to Mr Rollin.

The RIC 4C mentions in note an antoninian deems doubtful. Obverse: IMP CAES M ANT GORDIANVS AVG bust of Gordian III to the right, radaite, draped and cuirassed. Reverse: SABINA TRANQVILLINA AVG, Bust of Tranquillina to the right, draped, diademed and set on crescent. Source: ''Numismatic Chronicle 1867, proceedings, p.7, as found at Cowling near Strood.''. 

RIC 4C n °250 describes Gordian III standing on the right and Tranquillina on the left, it must be an error because I did not note any coin with this position for the characters. In addition, the coin illustrated on plate 3, n°19 shows Gordian III on the left and Tranquillina on the right. Unless the book describes another coin where the positions are reversed.