Hello, I have two byzantine coins to identified: First coin: diameter: 17 mm; weight: 4.3 grams. Second coin: diameter 22 mm; weight: 5.3 grams. Thanks.
the first one is the big I reverse type, i would guess justin and/or justinian, you can see one similar to it here at wildwinds... http://www.wildwinds.com/coins/byz/justin_I-justinian_I/t.html