David,
I am not quite sure of what you are asking.
The coins that you posted are obviously different
denominations from very different times and thus have different sizes.
But you seem to be noting discrepencies in some of your coins with other examples of the same
denomination and time. I am not sure that this is the case.
The
Aelia Flaccilla was issued in two parallel
denominations - an
AE4 and an
AE2. The larger
AE2 (yours) was struck on the same 1/60 of a
Roman pound
standard as the
contemporary GLORIA ROMANORVM,
Emperor standing on galley, struck at Eastern mints. Your 4.1 grams is a little low as the theoretical
weight was 5.45 g and averages were around 4.8 or 4.9 but as all such coins were struck al marco - that is at 60 to the pound with no necessity of getting each at 1/60th of a pound - and yours is worn and has been cleaned so such variation is not unusual at all.
Your
Theodora is a little on the light
side but that is again not unusual. This is more in line with the 337-341
average for all the small AE4s.
Your
Galeria Valeria is heavy but you have to remember that these were struck at two
weight standards - briefly at the heavier 1/48 L, which gives a theoretical
weight of 6.81 g, and then from the end of 309 till 311 at the
reduced 1/72 L or 4.54 g. So yours is a heavier one from circa 308-309.
As for the
Helena, do you mean the
PAX PVBLICA type? In theory this was only struck at one
standard during its 337-341 life. But the averages were falling throughout this period and as I noted above their is wide discrepancy in given
weights for many reasons.
Hope this helps a
bit.
Shawn
