Countermark

https://rpc.ashmus.ox.ac.uk/countermark/638 
GIC 511
ΑΔΡ
rectangular 
6 x 3 mm 
GIC noted coins of Macrinus and Trajan with this cmk; however, it is probable that all readings of ΑΔΡ on the Traianic coins were mis-readings of ΔΑΚ on GIC 529? 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC V.3, — (number not assigned), type ID 68737 Show 3986 4 5.3
RPC V.3, — (number not assigned), type ID 68737 Show 3986 5 5.3
RPC V.3, — (number not assigned), type ID 68736 Show 3987 1 5.3
RPC V.3, — (number not assigned), type ID 68752 Show 3988 7 5.3
RPC V.3, — (number not assigned), type ID 68752 Show 3988 9 5.3
RPC V.3, — (number not assigned), type ID 68752 Show 3988 10 5.3
RPC V.3, — (number not assigned), type ID 68738 Show 3989 3 5.3
RPC V.3, — (number not assigned), type ID 68738 Show 3989 7 5.3
RPC V.3, — (number not assigned), type ID 68738 Show 3989 8 5.3
RPC V.3, — (number not assigned), type ID 68738 Show 3989 12 5.3
RPC V.3, — (number not assigned), type ID 68737 Show 3986 3 5.3
RPC V.3, — (number not assigned), type ID 68738 Show 3989 6 5.3
RPC V.3, — (number not assigned), type ID 68736 Show 3987 5 5.3