The reverse depends on what the two letters are either side of coin, it looks like.
Probus Potin Tetradrachm of Alexandria. Year 3 = 277-278 AD. A K M AVP A K M AUR PRO-BOC CEB, laureate and cuirassed bust right / L-G, eagle standing left, head right, with wreath in its beak. Milne 4566; Emmett 3985.
Not that the letters on coin look like to letter Ls but infact one is G.
SS