Interesting subset. I didn't noticed before having it already Constantius II Vetranio Magnentius Decentius Q
Here is my site on the AE types of Vetranio: http://augustuscoins.com/ed/vetranio/Vetranio.html There are only six types, three AE2's and three AE3's. The most important is this one: It has the first overtly Christian legend on a coin. HOC SIGNO VICTOR ERIS "In this sign, you will be victorious" [Which God told Constantine before the Battle of the Milvian Bridge, Oct 28, 312.] Emperor standing holding standard with chi-rho, to r. is Victory, crowning him with wreath and holding palm branchThe type was issued for Vetranio (scarce) and Constantius II (scarce) at Siscia. Continued later for Constantius II and Gallus (rare) at both Siscia and Sirmium. (Sirmium had not been minting during the reign of Vetranio).With minor varieties, it is from Siscia (numerous RIC numbers) Cs 272-291, 304-311; V 275-292; G 306, 312. Sirmium (all with "III" in left reverse field): Constantius II 23, 30. Gallus 23, 31 Failmezger 416
Here's one that would have been a good fit in the broken coins thread. Being broken allowed me to buy it for only $9.50. Vetranio AD 350 Siscia, AD 350 Obv: D N VETRA-NIO P F AVG, laureate, draped, and cuirassed bust right; A to left Rev: CONCORDIA MILITVM, Vetranio standing left, holding labarum in each hand; star above; A to left; in exergue: •ΓSIS[?] Refs: RIC 281 or 274 Note: This coin is either RIC 274 or 281 depending on whether the mint mark ends in a dot or a star.
Doing the maths would drive you to consider the entire coin worth 12 USD ! Well done, it's a nice one ! Q