Second is a "fallen horseman" of one of Constantine's boys--I am pretty sure Constantius II. Legend reads "DNCONSTAN-(TIV)SPFAVG" / "FELTEMPRE-PARATIO". Pretty sure Constantinople mint. Extremely common.
How large is it? These came in two sizes--the larger cententionalis (about the size of a half dollar) and the smaller AE3 (between a nickel and quarter). The larger is worth slightly more, although such a common coin in this condition is probably worth $3-5 tops.
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