There is also a great deal of debate (or argument, if you prefer) as to what, exactly, those structures on top of the buildings are. Personally, I don't know, so I just refer to them as "turrets". If you prefer to call them something else, feel free to do so : )

When I buy a coin, I am often looking for subtle differences that set it apart from other coins that, at first glance, may be very similar. I may be attracted to a particular coin because of the way the devices are struck, or in the way they relate to the other features of the coin. So, while in general I may be looking for a specific emperor from a certain mint, I am also looking for coins that have (to me at least) a character all their own.

Of course, its just possible that I bought the coin because it was all I could afford at that particular time : )

Constantine I Antioch mint - 325-335 19mm, 3.65g 9 stone campgate, two turrets OBV: CONSTANTIVS AVG REV: PROVIDENTIAE AVGG EXG: SMANTB
Constantine I Alexandria mint 329-330 18mm, 3.40g 8 stone campgate, two turrets OBV: CONSTANTIVS AVG REV: PROVIDENTIAE AVGG FR: II FL: Wreath EXG: SMAL
Constantine I Cyzicus mint, 324-337 18mm, 3.67g 6 stone campgate OBV: CONSTANTINVS AVG REV: PROVIDENTIAE AVGG EXG: SMK (delta)
Constantine I Cyzicus mint, 324-337 18mm, 2.55g 6 stone campgate, two turrets OBV: CONSTANTINVS AVG REV: PROVIDENTIAE AVGG EXG: SMKA (pellet)
Constantine I Heraclea mint, 318-337 19mm, 3.19g 6 stone campgate, three turrets Tall, thin door OBV: IMP CONSTANTINVS AVG Left facing consular bust REV: PROVIDENTIAE AVGG EXG:SMHB FR: Pellet Nearly fully silvered
Constantine II Hereclea mint, 318-329 18mm, 3.18g 6 stone campgate, two turrets OBV: CONSTANTINVS IVN NOB C REV: PROVIDENTIAE CAESS EXG: SMHA (pellet) Some silvering remaining
Constantine II Hereclea mint, 227-329 18mm, 3.19g 8 stone campgate, two turrets OBV: CONSTANTINVS IVN NOB C REV: PROVIDENTIAE CAESS EXG: SMHA FL: Pellet
Constantine II Uncertain mint 6 stone campgate, three turrets OBV: DN FL CL CONSTANTINVS NOB C Small left facing consular bust REV: PROVIDENTIAE CAESS EXG: ? ? TC
Constantine II Rome mint 317-329 19mm, 2.72g 6 stone campgate OBV: CONSTANTINVS IVN NOB C Left facing bust, draped and cuirassed REV: PROVIDENTIAE CAESS EXG: R (wreath) T
Constantine I Siscia mint, 336-337 19mm, 2.94g 7 stone campgate, two turrets OBV: CONSTANTINVS AVG REV: PROVIDENTIAE AVGG EXG: (pellet)ASIS (pellet) Dots in top and bottom rows
Constantine I Siscia mint, 319-337 18mm, 3.12g 8 stone campgate, two turrets OBV: CONSTANTINVS AVG REV: PROVIDENTIAE AVGG EXG: (pellet) B SIS (pellet) Dotted edges of campgate. Dots in top row of stones
Constantine I Siscia mint, 321-329 19mm, 2.98g 8 stone campgate, two turrets OBV: CONSTANTINVS AVG REV: PROVIDENTIAE AVGG EXG: A SIS (double crescent) Dots in arched top row
Constantius II Siscia mint, 324-329 19mm, 3.25g 8 stone campgate, two turrets OBV: FL IVL CONSTANTIVS NOB C Left facing bust REV: PROVIDENTIAE CAESS EXG: (Delta) SIS (Double crescent) Dot at top of doorway. Dots in top and bottom row of stones. Some silvering remaining.
Constantine I Thessalonica mint, 326-328 20mm, 3.39g 7 stone campgate, two turrets OBV: CONSTANTINVS AVG REV: PROVIDENTIAE AVGG EXG: SMTSA FR: Pellet Campgate sits on angled base. Row of dots in arched top row of stones.
Constantius II Thessalonica mint, 324-329 18mm, 3.17g 6 stone campgate, two turrets OBV: FL IVL CONSTANTIVS NOB C REV: PROVIDENTIAE CAESS EXG: SMTSE
Constantine II Treveri mint, 326 20mm, 2.63g 6 stone campgate OBV: CONSTANTINVS IVN NOB C Left facing bust REV: PROVIDENTIAE CAESS EXG: P T ? (crescent with pellet)
Constantine II Uncertain mint, but may be Thessalonica 18mm, 3.32g 6 stone campgate OBV: CONSTANTINVS IVN NOB C Left facing bust REV: PROVIDENTIAE CAESS Large turrets, star directly between them