Roman Republican AE Sextans ca 230 BC, 36 mm, 50.94 g. 

Cockle-shell seen from the exterior, two dots and club below.
Cockle-shell seen from the interior, club below. 

Crawford 27/9; Sydenham 42; Thurlow-Vecchi 27; RBW 59; Haeberlin pl. 29, 13-17.

With permission of Numismatica Ars Classica - Spring Sale 2020, Lot 320, May 2020