Watch List notes:

P. Cornelius P.f. Blasio. Ca. 169-158 B.C. Æ as (33.5 mm, 26.28 g, 11 h). Rome mint. Scarce. Laureate head of bearded Janus; I above / P • BLA / ROMA, prow of galley right; I to right. Crawford 189/1; Sydenham 370. Fine. 

Note: this coin is almost double the weight of other examples.