Ancients
Diocletian (AD 284-305). AV aureus (20mm, 6.33 gm, 11h). NGC MS 5/5 - 4/5. Antioch, 1/50 of the Roman pound standard, AD 286. IMP C C VAL DIOCLETIANVS P F AVG, laureate bust of Diocletian left, wearing consular robes, scipio aquila in right hand / IOVI CONSERVATO-RI AVGG, Diocletian standing facing in military dress, laureate head right, scepter in left hand, receiving with right Victory on globe left from Jupiter standing facing, nude bust for chlamys across shoulders, head left, grounded scepter in left hand; N (mark of value=50) in central field, SMA in exergue. RIC V.II -. Calicó -. Lukanc, Diokletianus, p. 152, 5 (Dumbarton Oaks, same reverse die). Depeyrot p. 138, 4 (Dumbarton Oaks). Very rare - the second known specimen. Crisply struck and fully lustrous.
From the Monaco Collection. Ex Künker, Auction 347 (22 March 2021), lot 1228; Künker, Auction 304 (19 March 2018), lot 1342; Gemini I (11 January 2005), lot 443; Harlan J Berk, Buy or Bid Sale 96 (1997), lot 14
Otto Seeck and Karl Pink, in "Die Goldprägung des Diocletianus und seiner Mitregenten," NZ 64 (1931), pp. 57-58," correctly hypothesized the mark in the central field on this very rare issue designated the weight standard of 50 to the Roman pound (6.40 gm standard), as compared to the O issues (1/70=4.60 gm) and later X, Ξ, and Σ issues (1/60=5.30 gm).
https://coins.ha.com/itm/ancients/roman-imperial/ancients-diocletian-ad-284-305-av-aureus-20mm-633-gm-11h-ngc-ms-5-5-4-5/a/3094-32074.s?type=CoinArchives3094
HID02906262019
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Estimate: 20000-25000 USD