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 1354 8 4.3
RPC IV, 10242 (temporary) Show 1352 5 4.3
RPC IV, 4977 (temporary) Show 1353 12 4.3
RPC IV, 6180 (temporary) Show 1348 9 4.3
RPC IV, 5807 (temporary) Show 1354 11 4.3
RPC IV, 5807 (temporary) Show 1354 2 4.3
RPC IV, 10242 (temporary) Show 1352 4 4.3
RPC IV, 5807 (temporary) Show 1354 12 4.3
RPC IV, 6184 (temporary) Show 1355 1 4.3
RPC IV, 6180 (temporary) Show 1348 6 4.3
RPC IV, 4976 (temporary) Show 1358 2 4.3
RPC V.3, — (number not assigned), type ID 74025 Show 3087 15 5.3
RPC V.3, — (number not assigned), type ID 74025 Show 3087 23 5.3
RPC V.3, — (number not assigned), type ID 74034 Show 3086 12 5.3
RPC V.3, — (number not assigned), type ID 74034 Show 3086 7 5.3
RPC V.3, — (number not assigned), type ID 74025 Show 3087 2 5.3
RPC V.3, — (number not assigned), type ID 74025 Show 3087 21 5.3
RPC V.3, — (number not assigned), type ID 74665 Show 3090 11 5.3
RPC V.3, — (number not assigned), type ID 74665 Show 3090 14 5.3
RPC V.3, — (number not assigned), type ID 74665 Show 3090 13 5.3
RPC V.3, — (number not assigned), type ID 74666 Show 3092 2 5.3
RPC V.3, — (number not assigned), type ID 74666 Show 3092 3 5.3
RPC V.3, — (number not assigned), type ID 74666 Show 3092 8 5.3
RPC V.3, — (number not assigned), type ID 74668 Show 3089 7 5.3
RPC V.3, — (number not assigned), type ID 74668 Show 3089 6 5.3
RPC V.3, — (number not assigned), type ID 74665 Show 3090 17 5.3
RPC V.3, — (number not assigned), type ID 74665 Show 3090 2 5.3
RPC V.3, — (number not assigned), type ID 74035 Show 3094 4 5.3
RPC V.3, — (number not assigned), type ID 74025 Show 3087 14 5.3
RPC IV, 5807 (temporary) Show 1354 14 4.3
RPC V.3, — (number not assigned), type ID 74665 Show 3090 20 5.3
RPC IV, 5807 (temporary) Show 1354 16 4.3
RPC V.3, — (number not assigned), type ID 74668 Show 3089 5 5.3
RPC V.3, — (number not assigned), type ID 74666 Show 3092 11 5.3
RPC V.3, — (number not assigned), type ID 74025 Show 3087 31 5.3
RPC V.3, — (number not assigned), type ID 74665 Show 3090 19 5.3
RPC V.3, — (number not assigned), type ID 74665 Show 3090 6 5.3
RPC V.3, — (number not assigned), type ID 74034 Show 3086 16 5.3
RPC V.3, — (number not assigned), type ID 74034 Show 3086 17 5.3
RPC V.3, — (number not assigned), type ID 84046 Show 3091 8 5.3
RPC V.3, — (number not assigned), type ID 74666 Show 3092 16 5.3
Show 148
RPC IV, 4976 (temporary) Show 1358 15 4.3
RPC IV, 6180 (temporary) Show 1348 15 4.3
RPC IV, 5807 (temporary) Show 1354 17 4.3
RPC IV, 5807 (temporary) Show 1354 18 4.3
RPC IV, 17282 (temporary) Show 1345 3 4.3
RPC V.3, — (number not assigned), type ID 74034 Show 3086 15 5.3