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 1345 8 4.3
RPC IV, 10242 (temporary) Show 1343 5 4.3
RPC IV, 4977 (temporary) Show 1344 12 4.3
RPC IV, 6180 (temporary) Show 1339 9 4.3
RPC IV, 5807 (temporary) Show 1345 11 4.3
RPC IV, 5807 (temporary) Show 1345 2 4.3
RPC IV, 10242 (temporary) Show 1343 4 4.3
RPC IV, 5807 (temporary) Show 1345 12 4.3
RPC IV, 6184 (temporary) Show 1346 1 4.3
RPC IV, 6180 (temporary) Show 1339 6 4.3
RPC IV, 4976 (temporary) Show 1349 2 4.3
RPC V.3, — (number not assigned), type ID 74025 Show 3038 15 5.3
RPC V.3, — (number not assigned), type ID 74025 Show 3038 23 5.3
RPC V.3, — (number not assigned), type ID 74034 Show 3037 12 5.3
RPC V.3, — (number not assigned), type ID 74034 Show 3037 7 5.3
RPC V.3, — (number not assigned), type ID 74025 Show 3038 2 5.3
RPC V.3, — (number not assigned), type ID 74025 Show 3038 21 5.3
RPC V.3, — (number not assigned), type ID 74665 Show 3041 11 5.3
RPC V.3, — (number not assigned), type ID 74665 Show 3041 14 5.3
RPC V.3, — (number not assigned), type ID 74665 Show 3041 13 5.3
RPC V.3, — (number not assigned), type ID 74666 Show 3043 2 5.3
RPC V.3, — (number not assigned), type ID 74666 Show 3043 3 5.3
RPC V.3, — (number not assigned), type ID 74666 Show 3043 8 5.3
RPC V.3, — (number not assigned), type ID 74668 Show 3040 8 5.3
RPC V.3, — (number not assigned), type ID 74668 Show 3040 7 5.3
RPC V.3, — (number not assigned), type ID 74665 Show 3041 17 5.3
RPC V.3, — (number not assigned), type ID 74665 Show 3041 2 5.3
RPC V.3, — (number not assigned), type ID 74035 Show 3045 4 5.3
RPC V.3, — (number not assigned), type ID 74025 Show 3038 14 5.3
RPC IV, 5807 (temporary) Show 1345 14 4.3
RPC V.3, — (number not assigned), type ID 74665 Show 3041 20 5.3
RPC IV, 5807 (temporary) Show 1345 16 4.3
RPC V.3, — (number not assigned), type ID 74668 Show 3040 6 5.3
RPC V.3, — (number not assigned), type ID 74666 Show 3043 11 5.3
RPC V.3, — (number not assigned), type ID 74025 Show 3038 31 5.3
RPC V.3, — (number not assigned), type ID 74665 Show 3041 19 5.3
RPC V.3, — (number not assigned), type ID 74665 Show 3041 6 5.3
RPC V.3, — (number not assigned), type ID 74034 Show 3037 16 5.3
RPC V.3, — (number not assigned), type ID 74034 Show 3037 17 5.3
RPC V.3, — (number not assigned), type ID 84046 Show 3042 8 5.3
RPC V.3, — (number not assigned), type ID 74666 Show 3043 16 5.3
Show 126
RPC IV, 4976 (temporary) Show 1349 15 4.3
RPC IV, 6180 (temporary) Show 1339 15 4.3
RPC IV, 5807 (temporary) Show 1345 17 4.3
RPC IV, 5807 (temporary) Show 1345 18 4.3
RPC IV, 17282 (temporary) Show 1336 3 4.3
RPC V.3, — (number not assigned), type ID 74034 Show 3037 15 5.3