Obv.: no legend
Rev.: CONSTAN / TINVS / AVG
Below: SMRS
Mint: Rome, 2nd officina
Measurements: 2.54g., 19mm, 12h
Date: AD 329
Ex: Bertolami Auction 24, 22/23.06.2016, lot 935
RIC 281
Extremely fine condition, especially for this issue. According to L. Ramskold, this coin belongs to the second issue of dynastic coins that was produced in AD 329. The "SM" mintmark, and special nature of the coins, strongly suggests these coins were issued when Constantine was present in Rome, with the diadem indicating a date after AD 327. Ramskold plausibly suggests a visit to Rome for Helena's funeral in 328-329 AD or the timing of this issue.
Reference : https://www.researchgate.net/publication/278128917_Constantine%27s_Vicennalia_and_the_Death_of_Crispus
Collection : Constantine I