From what I've seen Constantinian silver in general - the early
argenteus as well as these later
denominations from c.320 - all seem to have surprisingly
poor weight control, but they are
still clustered around these nominal
weights (mostly
siliqua &
miliarense). In some cases (e.g.
RIC VII Sirmium 14 - Crispvs Et Constantinvs CC) a single
RIC listing seems to maybe cover multiple
denominations of the same
reverse type rather than just a very broad
weight range.
It's be interesting to know why the
weight control was so
poor. Were these really used as coins vs bullion (i.e based on
weight), or was the
face value higher than the bullion content so that it didn't matter so much anyway?
Still odd since the
weight control for gold seems to have been much better and the volume of silver doesn't seem to have been so great as to necessitate sloppyness.
Ben