City commemoratives were made in two sizes. Early ones tend to weigh over 2g. and match the two soldiers/two standards coins issued at the same time. Later ones weigh under 2g. and accompanied the later two soldiers/one standard coins. Coins one and four are early; 5 and 6 are late. Three looks a bit too small so I agree it may be barbarous. I'd need a weight to comment on coin 2. Coin 7 should weigh the same as 5 and 6 but has a chippy edge so will probably be lighter for that reason. Constantine died after the switch to the smaller coins so all his death issues are small format. Rules vary a bit from mint to mint so we can't be too hardcore on exact weights but these are the tendencies.