Many of the coins posted above are Byzantine anonymous folles. CT has a recent thread on them: https://www.cointalk.com/threads/byzantine-anonymous-folles.322682/ Here is a Class I anonymous follis: Class I. Sear 1889. Nicephorus III, 1078-1081 23 mm. 3.84 grams.
One of my favorites, It is a SBCV -1920 , the reverse is shot , this obverse got the detail. It is 17mm. Interesting note, the image of Christ was based on Zeus, the earlier depictions of him depicted considerable different, not as powerful figure. In coinage of the Byzantine empire they replace the deity's commonly seen on Roman Imperial coins with the saints, so in time of war you might see St George on the coin or Saint Demetrius.
The bearded Byzantine Christ Pantocrator image is indeed a far cry from the beardless youth we see in the sixth-century Arian baptistery in Ravenna.
Nice coins. My Serbian medieval coins with Jesus Christ: King Stefan Dragutin (Ruler of Raska 1276-1282 and Srem 1284-1316, Serbia), silver "lily-and-cross" coin, 2.2g Obverse: King on low-back throne, holding lily-tipped scepter and globus with double cross, Latin legend STEFAN REX ("Stefan King") Reverse: Christ enthroned, holding Book of Gospels, lilys on each side, Latin legend IC-XC ("Jesus Christ") King Stefan Uros II Milutin 1282 - 1321, Serbia, Silver "Banner" coin. 2g Obverse: Bare-headed king receiving banner from St. Stephen, holding scrolls with his left hand, Latin legend: VROSIUS REX S STEFAN ("Uros King, St.Stephen"). Reverse: Christ enthroned, holding Book of Gospels, Latin legend: IC - XC
A Very interesting article that is trying to use coins date the Shroud of Turin with coins. It uses dozens of Christ coins. https://www.academia.edu/35675732/Numismatic_Dating_of_the_Shroud_S23
He is just trying to prove the dating of the Turin through coins, I agree with you, its not clear but it is very interesting to follow the different depictions of Christ on Byzantine and other cultures coinage.
The article was... entertaining. I suspect the portrait style variations have more to do with how people looked in those eras and locales-- how the men wore their hair, etc-- rather than modeling after the shroud of Turin.