I've seen worse! I see the possibility that the right one is Decentius Rome mint RIC 215 page 268 but JA may be right. Of your coins shown so far, this is the best IMHO but I like Magnentius more than most people.
Every so often I feel the need to show this regrettable coin. I found it in a junk box many years ago and made it into a necklace for my wife who has worn it a number of times. The obverse is shot but most likely Magnentius. I feel guilty turning any coin into jewelry but this one was one sided so I did. It got worse whn my wife and I had dinner with Valentinian and his wife at the home of a mutual friend and he commented on a point I had missed. The coin has a definiteSiscia mintmark and there are no known coins of Magnentius from that city. Oops! I feel better in that the spelling errors make it quite certainly barbarous but why someone copied a common reverse of Magnentius and changed the mintmark to Siscia is just another of those question that will never be answered. Look at the good side: I didn't drill a hole in it. Show any coins that prove you are dumber than a box of rocks.
I got this bust cent when I was 10, purely because I didn't have a bust cent at the time, huge mistake, spent 50 bucks on this one.
FEL TEMP REPARATIO is a very common late Roman legend, but less so on coins of Magnentius. Here is a "galley" type: 23 mm. 5.25 grams. 6:00 die axis. Head right, bare. A behind neck. Emperor in military dress standing left on a galley, holding victory on globe and standard with chi-rho, Victory at stern holding rudder. A in field left. TRS in exergue. RIC Trier 260. Failmezger 424.
Yes, this one is hard for me. I upgraded mine with one no better - just different. I kept both. That is a problem and bonus with Magnentius. There are many variations on coins that are the same.
I have finally tracked down my own Galley type. Bastien dates this type to being issued between the usurpation by Magnentius on 18th January A.D. 350 and his taking of Rome on 27th February A.D. 350. Magnentius Obv:– IM CAE MAGN-ENTIVS AVG, bare-headed, draped, cuirassed bust right, A behind bust Rev:– FEL TEMP-REPARATIO, emperor standing left on galley, holding Victory and labarum, Victory seated at the helm. A in left field Mint – Trier (//TRS). 1st Phase. 18th January A.D. 350 to 27th February A.D. 350 Reference(s) – Cohen 11. Bastien 11 (12 examples cited). RIC VIII Trier 260 I need to go back and try and take better photos.
