If you are just looking for one example I'd shoot an anonymous Janus/prow with strong eye appeal in the $150 range. They can get pricey with the different field marks. But for $150, if you shop around, you could get a real nice example. Lucernae has decent ones from time to time.
Bunch of Asses: RR AE As P.CORNELIUS P.F. BLASIO BC 169-158 35mm 42.5g Sear 703 Syd 370 Craw 189/1 RR Atili Saran AE As 148 BC Janus ROMA Prow Sear 399 Craw 214/2a RR Anon AE As 211-206 BC sextantal Janus Prow Anchor Sear 628 Craw 50/3 RR Anon AE As after 211 BC Janus I Prow Craw 56/2 Sear 627 Iberia Castulo Late 2nd C BC AE As 25mm Bust Nose Hand Sphinx RImp Pompey 42-38 BC AE As Janus Prow Magnus Sear 1394 Craw 479/1
Mine, very similar to @Alegandron's Republic, As minted in Rome, circa 211-206 BC No legend, head of janus Prow of galley right, ROMA at exergue, I above galley 37.22 gr Ref RCV # 627 Castulo, Spain, AE As - 2nd century BC Virile head right, a hand before Sphinx walking right. Iberian for KASTILO at exergue 15.9 gr Ref : Sear GIC #15, Catalogue 38 and 39 CNH (CORPVS NVMMUM HISPANIAE, L. Villaronga) looks very much like a can opener, which it is NOT D. Junius L.F. Silanus, As minted in Rome, 91 BC No legend, Head of Janus D SILANVS L F, Prow of galley right 12.08 gr Ref : RCV # 738 Sextus Pompey, As struck in Sicily c.43-36 BC Head of Janus with features of Pompey the Great, MAGN above Prow of galley right, PIVS IMP in field 16.57 gr Ref : HCRI # 336, RCV #1394, Cohen #16 And, not far from an as is this dupondius appart from Janus being replaced by two portraits Octavian & Agrippa, AE Dupondius Arausio mint (Orange), 30-29 BC (Colonia Firma Julia Secundanorum Arausio) IMP DIVI F (IMPerator DIVI Filii), bare heads of Augustus (right) and Agrippa (left), back to back Prow of galley right, ram's head (?) enclosed in a medaillion above 17.61 gr - 28 mm. Ref : RPC # 533 Ex. CNG e-auction #181/28, from the Patrick Villemur collection Q
So COOL! In my mind, I can see this was holed coin on a chain necklace. Someone may had ripped the coin right off the chain, ripping the hole out. OR, NOT a can opener, rather a BOTTLE CAP OPENER - and you are using it today!
Not a real expensive example, but I think it is a good start and was issued in the period between the final two Punic Wars.
I know it's a little too late but here's another good resource for you or others contemplating a similar purchase in the future. This page from McCabe's website is a great, succinct guide to the Second Punic War bronzes and some of the silver.
Late to this thread, but had to post mine: 37.4 g, cost $140 (all in), very nice & chunky, @stevex6 is right about how these feel in hand: My Pompey as (good thing there are two chances at the portrait):