Crawford 237/1a, Roman Republic, 136 BC., moneyer Cnaeus Lucretius Trio, Denarius.

Roman Republic (Rome mint 136 BC.), moneyer Cnaeus Lucretius Trio.
Denarius (16-17 mm, 3,80 g), silver, axis about medal alignment ?? (ca. 340°),
Obv.: Helmeted head of Roma to right; behind, TRIO; below chin mark of value, X (= 10 As).
Rev.: The Dioscuri, Castor and Pollux on horseback, galloping right, cuirassed with the cloak flowing over their shoulders, wearing a cap [surmounted by a star], each holding a javelin; below, CN LVC[R]; in exergue, ROMA.
Crawford 237/1a ; Sydenham 450 ; Bab. Lucretia 1 .
Small flan, some fields with old iridescent cabinet tone, EF

This is the last use for the denarius of this type with the Dioscuri galloping to the right.
Crawford has estimated 170 obverse dies and 212 reverse dies for two varieties of this issue.
For theses issues, Cnaeus Lucretius Trio, Lucius Antestius Gragulus and Caius Servilius are associated as Triumvir monetalis.