Countermark

https://rpc.ashmus.ox.ac.uk/countermark/953 
GIC 839
IMP·VES (on silver coins) (sometimes retrograde)
rectangular 
8 x 3 mm 
Martini-Pangerl 100. Applied at Ephesus between 1 January 74 and 23 June 79, at the same time as GIC 840 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC II, 835 Show 835 3 2
RPC II, 846 Show 846 5 2
RPC II, 850 Show 850 2 2
RPC II, 850A Show 850 1 2
RPC II, 853 Show 853 2 2
RPC II, 853 Show 853 16 2
Show 17
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Show 15
Show 16
Show 21
Show 14
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Show 19
Show 1
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Show 18
Show 7