I enjoy how these two coins together illustrate the variety of acceptable forms of the letter A in the Latin alphabet at the end of the third century. That on each specimen two very different forms of the same letter co-exist warns the epigrapher against using these letter forms alone as a dating criteria. It also suggests to me that certain names were rendered in particular ways habitually. Compare for instance the VAR ligature of RRC 126/1 with that C.VAR ligature of RRC 74/1 (links to BM specimen). ROMA has an open single bar A because that’s just how the word looks right.