Cr. 162/4 "MAT" series Æ Semis, Rome mint, 179-170 B.C.
Roman Republic Æ Semis(14.33g, 21mm, 2h), Anonymous("MAT" series), 179-170 BC. Laureate head of Saturn right; behind, S/Prow right; above, MAT monogram; before, S; below, ROMA. Crawford 162/4
Ex AnYangMan, CoinTalk, 5/6/2019, ex Karel de Geus auction 46, 29-30 October 2018, lot 2201(part), ex Rob Rueb Collection(d. 1987), ex Edward A Sydenham collection, Rodolfo Ratto 7 February 1928, lot 561
Rob Rueb was a judge in the city of Arnhem(Gelderland), NL. Edward A Sydenham was, of course, author of "The Coinage of the Roman Republic", often referred to simply as "Sydenham", the standard reference before the publication of Crawford.