It's easier to work on these puzzles when you show the full images in line rather than as thumbnails (also helps to join the two sides). Hmm. Provincial portraits often look nothing like the person (or at least nothing like the person as depicted on their Imperial coins). You'll probably need to rely more on the legends for this one. The first part of the legend is AYT K but that doesn't help much since it is just title abbreviations. The next letter (or is it two closely spaced letters?) aren't easily discerned, and then it looks like an O. The O might help narrow it down because that letter is probably part of the emperor's name, perhaps the second letter. I'm getting a Volusian vibe (just a hunch-- I haven't really studied your coin or archives), although his name on provincials isn't going to be as simple as Greek letter substitution for "Volusian", unfortunately. Many permutations exist across his range of provincials (same holds true for most provincials). The reverse is Tyche, as you identified. When you start searching, use Tyche rather than Fortuna because it is a provincial.
Congratulations to Roman Collector to getting this one. It is unusual in that the reverse figure is named on the coin (TYXH Tyche). The other tricker it that Valerian and other naames starting with V in Latin will be OV in Greek. The other big clue is the Pi for Publius since few of the choices used that praenomen. You have to get up early here to get in on the fun. Considering that CT Ancients covers most of the time zones 'early' has less meaning than it once did.
