seth

It's a drachm, the specs fit. With 3.85g it falls to the lighter side of the denomination but lighter ones are recorded. Authentication is hard based only on internet photos, but you might want to go to http://forgerynetwork.com/ and check out their database with fakes to see if any of them is a die match.
But I think it is most likely real.

I had one collector who emailed me saying that it was made on 1 & 2 pengo coins 1941-1944 by commie partisans who roamed an area in today's S-E Slovakia to keep track of the coins that circulated on their territory, kind of like ancient gallic, germanic or thracian tribes used to do w/ roman currency that came to be used there.
Unfortunately he couldn't give any real reference for his story so I am still not convinced.

That's pretty much why I am still asking around

I think it's rather Zeno AE4 RIC X Thessa or Nicomedia 964, Thessa being more common so more likely.

Hello Mihai

Your coins are from left to right, top to bottom:

1. Probus antoninianus, IMP PROB-VS PF AVG/VICTORIA GERM, Rome, RIC V-2 Rome 220, Common, 276-282AD.
2. Valentinian I AE3, DN VALENTINI-ANVS PF AVG/SECVRITAS REIPVBLICAE, Thessalonika, RIC IX Thessa 18a/27a type i, Common, 367-375AD.
3. Licinius II AE3 follis, DN VAL LICIN LICINIVS NOB C/IOVI CONS-ERVATORI CAESS, Antioch, RIC VII Antioch 29 R1, 317-320AD.
4. Constantius II AE3, DN CONSTAN-TIVS PF AVG/FEL TEMP REPARATIO, Cyzicus, RIC VIII Cyzicus 113, Common, 355-360AD.
5. Maximianus I AE2 follis, IMP CMA MAXIMIANVS PF AVG/GENIO POPV-LI ROMANI, Thessalonika, RIC VI Thessa 19b, Common, 298-299AD.

Hello guys, a positive id for this would be:

Constantius Gallus AE3
DN CONSTANTIVS IVN NOB C; bare-headed draped cuirassed bust r.
FEL TEMP REPARATIO; roman soldier spaering fallen horseman
BSIRM in exe.
RIC VIII Sirmium 49
351-354AD.

Thank you kindly, Art
I hope so too.

Hello all, this is my first message here, thank you for having me
I came across this very interesting coin (in my opinion) that I couldn't find much about online.
It is a KM251 1pengo 1941 BP, Al but it has this interesting sickle & hammer countermark on the rev.
I would like to ask you for more information about these countermarks, if possible. Why were they made? By whom? Are these rare? etc.
Thank you very much
All best regards.