Ancient Roman/Greek specimens - Basic Help Requested

I recently acquired these coins, and would greatly appreciate any help you can provide. I went to the Forvm site and a few other Ancients sites and could only ID them preliminarily as Roman/Greek in origin. Thanks in advance!
[Coins 1,2]

 

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They are romans of Crispus, second is Constantine I, third is Claudius.

 

Mat has already given the IDs, but here is the reference for the first one (need the reverse on the last to reference it):

1. Arles, RIC VII 163 Crispus AE3. 318 AD. CRISPVS NOB CAES, laureate draped & cuirassed bust right / PRINCIPI IVVENTVTIS, Mars standing left, naked except for helmet, chlamys and boots, left hand on shield on ground, spear in right, Q star-in-crescent A in ex.

 

Thanks! Here is the reverse. Its hard to see but there is an image of a man on a horse.

 

Coin 2. London, Constantine I, RIC VI 281, 312-13 AD, IMP CONSTANTINVS P AVG, laureate and cuirassed bust right/ SOLI INV-I-CTO COMITI, Sol right, head left, PLN in exergue, star in left field

 

I'm not sure about the last. I think I see a rider on a horse on top of something. If so, it could be:

RIC 114 sear5 #1852 ClaudiusAE Sestertius. TI CLAVDIVS CAESAR AVG P M TR P IMP P P, laureate head right / NERO CLAVDIVS DRVSVS GERMAN IMP, S C across field, Arch of Nero Claudius Drusus: triumphal arch consisting of single arch & decorated piers set on raised base with four columns supporting ornate attic.

 

Also, the Claudius appears to have a countermark about 10 o clock.

 

Yes, you are exactly right. I forgot to mention that. I wonder what that was used for?

 

There are collectors that specialize in countermarks. They can be fascinating in and off themselves.

 

Sometimes to retariff a worn coin for further use in commerce, other times to denote a special area where a coin was to circulate. There were a few reasons for it. They are fairly common on 1st century Roman bronzes.

 

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