This thread is 5 years old, still have the coin and it's been posted many times before. Someone just bumped it.
Sort of a question of faith. Sear is the most recent reference and reflects much more recent data. Sear attributes this issue to either Viminacium or Mediolanum.
Sear's book is most recently published, but he relies on data from others...for this issue he uses Göbl and even acknowledges him in the intro. Göbl has a lot of data in his book, so it is not merely a catalogue; but it is in German.
I have a Saloninus I really like. Saloninus Obverse: SALON VALERIANVS NOB CAES, radiate, draped and cuirassed bust right; Reverse: SPES PVBLICA, Saloninus (on left) and Spes (on right) standing confronted, Spes is raising skirt and presenting flower to prince, Saloninus holds scepterin left Billon antoninianus, Göbl MIR 1696d (Samosata), RIC V 36 (Antioch), Cohen 95, AHG 318 Syrian mint, as caesar, late 258 - 260 A.D.