I recently decided to collect the Constantinopolis from Arles by field marks. I used to have them all, but sold them and have decided to start again, like a New Year's goal, I suppose. There are 10 different symbols, but 11 types counting the coin with no marks. These are only from RIC VII. The Chi Rho mark was issued twice during this period, so both are #8. Ideally, there is a size/ weight difference between the two because of a standard change. The previous coins were struck at 132 per pound, but in 336, the coins were struck at 196 per pound. That is why the GLORIA EXERCITVS coins went from two standars to just one-- smaller flans.
Obv. CONSTAN-TINOPOLIS laureate, helmeted, wearing imperial mantle, holding scepter.
REV- Victory stg. on prow, holding long scepter in r. hand, and resting l. hand on shield
1. Plain (RIC 344) A.D. 330
2. Star (RIC 352) A.D. 330- 331
3. Crescent (RIC 357) A.D. 331
4. Single branch (RIC 363) A.D. 332
5. Tripe branch frond (RIC 369) A.D. 332- 333
6. Wreath (RIC 374) A.D. 333
7. Dot in wreath (RIC 380) A.D. 333- 334
8. Chi-Rho (RIC 386/401) A.D. 334/ 336
9. Pine tree (RIC 393) A.D. 335
10. X (RIC 408) A.D. 336- 337
11. O (RIC 416) A.D. 337