Can anyone help with some ideas of the obverse legend, please? (or even the reverse legend? Not a 'Fel Temp'.)
Definitely a barbarous fel temp. Neat coin Blundered legend pearl-diademed, draped, cuirassed bust right, Blundered legend soldier spearing Horseman
Looks barbarous to me, too. The eye on the obverse looks particularly strange. However, I have found that sometimes corrosion can make a legend on an official issue look like gibberish, too. Parts of letters disappear, leaving fragments behind, and blobs grow out of areas that were originally flat. If I have a few beers and really use my imagination, I can almost make out T _ _ S P F A _ _ on the right side, suggesting that the obverse legend was at least intended to mimic D N CONSTAN-TIVS P F AVG.