Well. tough to post mine after @octavius displayed his amazing coin .. I doubt there is one better in existence (but what do I know?). Thank you for sharing! But what the heck... Agrippa is one of the most accomplished men to ever grace a coin. A favorite for me - so this coin is light on Neptune but not so bad on the main man!
Nice one! I have the sestertius too, with Neptune to the right. Dark green patina, with reddisch colouring, a difficult one to take a proper picture of with the limited equipment I have. This Neptune is holding an acrostolium. It's also possible it's holding a dolphin. difficult to see. I still have to update the reference, because I think its 652 (slight drapery) and not 651. I believe I see some drapery with your buste as well. And what is your Neptune holding? I can't quite see.
My coin has slight drapery to the bust and Neptune is holding an acrostolium. It looks like yours is holding a dolphin. Nice coin.
Here's my Agrippa. Caligula (Agrippa) (Augustus) Coin: Bronze AS M AGRIPPA. L. F. COS. III - Head left, wearing rostral crown S-C across field - Neptune standing left, holding small dolphin and trident. Exergue: Mint: Rome (37-41 AD) Wt./Size/Axis: 11.70g / 28.45mm / 6h Rarity: Common References: RIC I 58 (Gaius) BMCRE 161 (Tiberius) Cohen 3 Acquisition/Sale: 22noelnoel22 Ebay $0.00 08/18 Notes: Feb 28, 20 - The Gary R. Wilson Collection
POSTUMUS Antoninianus C 205 - RIC Vb 76 IMP C POSTVMVS PF AVG Radiate, draped and cuirassed bust right NEPTVNO REDVCI Neptune standing left, holding dolphin and trident
Here are a few Poseidons that I can toss out... Makedon Perseus 178-168 BCE AE 23 Poseidon Club Sicily Syracuse Hieron II 275-215 BCE AE20 Poseidon Trident Dolphin Left Lucania Paestum (Poseidoneia) 218-201 BCE AE Semuncia Poseidon-Dolphin (started cut for change) Craw 4-1