Bronze coinage was issued in 5 denominations: A size = 23+ mm = 10+ g B size = 18–23 mm = 6.77–8.63 g C size = 13–17 mm = 3.88 g D size = 12–13 mm = 1.59 g E size = 10–12 mm = 1.13 g Source: https://en.wikipedia.org/wiki/Seleucid_coinage?oldformat=true If a coin has lost weight / size due o whatever reasons do you still use the denomination of the coin's description? For example, I got this Antiochus IX coin from a multiple lot; it obviously has lost size and weight: Syria, Seleukeia ad Pieira, Antiochia ad Orontem, 113 – 112 BC 16.31 x 16.76 mm, 5.675 g, 7h SC (part 2) 2364.2d; CSE 332; Hoover HGC 1248; SNG Spaer-2687-96; Ob.: Diademed head of Antiochus IX to r. with short beard. Rev.: BAΣIΛEOΣ ANTIOXOΥ ΦIΛOΠATOPOΣ at right and left of winged thunderbolt; below, monograms Is it still a Denomination B coin according to https://numismatics.org/sco/id/sc.1.2364.2d even though the weight and size is less than the ones corresponding to Denomination B? I'm really gratreful for your insight
Those letter denominations are completely arbitrary and should be a loose guide line at best. The only official bronze denominations are chalkous, obol/diobol, Dichalkon, Hemichalkon, and Tetrachalkon. I believe the letter denominations were a way to attempt to make a standard to measure all the different sizes. Unfortunately this system does not account for size changes over the 250 year history of the empire and the fact the bronze coins were not all made to strict standards like precious metal coins were. The only time I list a to e denomination is that is how it is listed in the SC catalog, and makes it a little easier to find sometimes. Honestly I wouldn't bother listing the denomination unless it's one of the known Greek ones. Usually ae will suffice. Your coin is still denomination B in their catalog but it's size has changed from early empire B's, which is why it's moot to even list it in my opinion.
