My RR example shows "Two hands clasped round winged caduceus". The fingers are straight. It looks like the caduceus is behind and not between the hands. PS - my coin is in the lock box and I do not have a pic at home, so I borrowed the one above from NAC vis acsearch.
Very nice Balbinus, Pishpash. In my example of that coin the grip makes it look like the thumb of one of the "shakers" is being squeezed silly even though the hand is open. See how it trails off just after the point where the other thumb makes contact: Here's another open hand shake on a coin for Crispina (seller photo):
..wow Pish! that is one heckofuh coin!.. i don't have either or of Balbinus or clasped hands..very nice!!...
Here are a few Eastern Flavian clasped hands. Vespasian AR Denarius, 3.48g Ephesus (?) mint, 76 AD RIC 1475 (R). BMC 490. RSC 163a. RPC 1452 (6 spec.). Obv: IMP CAESAR VESPASIANVS AVG; Head of Vespasian, laureate, r., a small 'o' mint mark below neck Rev: FIDES PVBL; Hands clasped over caduceus, two poppies and two corn ears Titus as Caesar AR Denarius 3.28g Ephesus (?) mint, 76 AD (Vespasian) RIC 1485 (R). BMC p. 102 note. RSC 87. RPC 1459 (2 spec.). Obv: T CAES IMP VESP CENS; Head of Titus, laureate, bearded, r. 'o' mint mark below neck Rev: FIDES PVBL; Hands clasped over caduceus, two poppies and two corn ears Domitian as Caesar AR Denarius, 3.26g Ephesus (?) mint, 76 AD (Vespasian) RIC 1495 (R). BMC 491. RSC - . RPC 1467 (4 spec.). Obv: CAESAR AVG F DOMITIANVS; Head of Domitian, laureate, bearded, r. 'o' mint mark below neck Rev: FIDES PVBL; Hands clasped over caduceus, two poppies and two corn ears