I recently acquired the Byzantine Anonymous AE follis pictured above, 10.48 gm, 29 mm, 6h. The coin was attributed to Class A2, A.D. 976-1065, Sear 1813, and this has raised some questions. The best reference source I have on Byzantine coins is the 1987 edition of David Sear's book BYZANTINE COINS AND THEIR VALUES, which is 32 years old. He does list a Class A3 as identified by D. M. Metcalf, and my coin seems to fit neatly into that classification. He also states that the well known expert and author Philip Grieson doesn't recognize the A3 class. What is the current thinking on this issue? Is my coin A2 or A3? I noticed that David Vagi does recognize the A3 class on coins that are slabbed at NGC, see example pictured below. Also his date range is c. 1020-1028. Does this remarkably short date range seem realistic? I have another question in regards to the short abbreviated inscription on either side of Christ. All the coins I've seen identify this inscription as IC XC, however, my coin reads IC XI, as many others do, see CNG example pictured below. On some examples the XC on the right side of Christ is easy to recognize, see example below from CoinTalk member stevex6. Can anyone explain the differences in the inscriptions for me?