Countermark

https://rpc.ashmus.ox.ac.uk/countermark/549 
GIC 427
prize crown between Ι and Ɛ
circular 
6.5 mm 
GIC had prize crown between torches. Later examples seem to show that it is between Ι - Ɛ (for Hierapolis). Suggested that the cmk was applied under Macrinus to older coins of larger denominations (27 to 42 mm) to fill the gap that no coins of larger denominations were struck under him. 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC II, 1784 Show 1784 4 2
RPC IV, 5807 (temporary) Show 1351 8 4.3
RPC IV, 10242 (temporary) Show 1349 5 4.3
RPC IV, 4977 (temporary) Show 1350 12 4.3
RPC IV, 6180 (temporary) Show 1345 9 4.3
RPC IV, 5807 (temporary) Show 1351 11 4.3
RPC IV, 5807 (temporary) Show 1351 2 4.3
RPC IV, 10242 (temporary) Show 1349 4 4.3
RPC IV, 5807 (temporary) Show 1351 12 4.3
RPC IV, 6184 (temporary) Show 1352 1 4.3
RPC IV, 6180 (temporary) Show 1345 6 4.3
RPC IV, 4976 (temporary) Show 1355 2 4.3
RPC V.3, — (number not assigned), type ID 74025 Show 3076 15 5.3
RPC V.3, — (number not assigned), type ID 74025 Show 3076 23 5.3
RPC V.3, — (number not assigned), type ID 74034 Show 3075 12 5.3
RPC V.3, — (number not assigned), type ID 74034 Show 3075 7 5.3
RPC V.3, — (number not assigned), type ID 74025 Show 3076 2 5.3
RPC V.3, — (number not assigned), type ID 74025 Show 3076 21 5.3
RPC V.3, — (number not assigned), type ID 74665 Show 3079 11 5.3
RPC V.3, — (number not assigned), type ID 74665 Show 3079 14 5.3
RPC V.3, — (number not assigned), type ID 74665 Show 3079 13 5.3
RPC V.3, — (number not assigned), type ID 74666 Show 3081 2 5.3
RPC V.3, — (number not assigned), type ID 74666 Show 3081 3 5.3
RPC V.3, — (number not assigned), type ID 74666 Show 3081 8 5.3
RPC V.3, — (number not assigned), type ID 74668 Show 3078 7 5.3
RPC V.3, — (number not assigned), type ID 74668 Show 3078 6 5.3
RPC V.3, — (number not assigned), type ID 74665 Show 3079 17 5.3
RPC V.3, — (number not assigned), type ID 74665 Show 3079 2 5.3
RPC V.3, — (number not assigned), type ID 74035 Show 3083 4 5.3
RPC V.3, — (number not assigned), type ID 74025 Show 3076 14 5.3
RPC IV, 5807 (temporary) Show 1351 14 4.3
RPC V.3, — (number not assigned), type ID 74665 Show 3079 20 5.3
RPC IV, 5807 (temporary) Show 1351 16 4.3
RPC V.3, — (number not assigned), type ID 74668 Show 3078 5 5.3
RPC V.3, — (number not assigned), type ID 74666 Show 3081 11 5.3
RPC V.3, — (number not assigned), type ID 74025 Show 3076 31 5.3
RPC V.3, — (number not assigned), type ID 74665 Show 3079 19 5.3
RPC V.3, — (number not assigned), type ID 74665 Show 3079 6 5.3
RPC V.3, — (number not assigned), type ID 74034 Show 3075 16 5.3
RPC V.3, — (number not assigned), type ID 74034 Show 3075 17 5.3
RPC V.3, — (number not assigned), type ID 84046 Show 3080 8 5.3
RPC V.3, — (number not assigned), type ID 74666 Show 3081 16 5.3
Show 128
RPC IV, 4976 (temporary) Show 1355 15 4.3
RPC IV, 6180 (temporary) Show 1345 15 4.3
RPC IV, 5807 (temporary) Show 1351 17 4.3
RPC IV, 5807 (temporary) Show 1351 18 4.3
RPC IV, 17282 (temporary) Show 1342 3 4.3
RPC V.3, — (number not assigned), type ID 74034 Show 3075 15 5.3