No, it has not been posted yet. It is a FEL TEMP REPARATIO type with the emperor standing and only one captive (and no "Hut").
That's the one from Thessalonica, isn't it? I might still have one of those, but I don't have a photo of it. I'll check this weekend. If I do, I'll photograph it and post it unless someone beats me to it.
Here's mine. It took a while to find an OK one, and definitely tough to find one much better. Maybe someone has one? This is RIC VIII Thessalonica 178, issued in 351 AD, maybe in response to Constantius' initial victory over Magnentius at the Battle of Mursa in the neighboring province of Pannonia. There's a fun kind of symmetry to a rare FEL TEMP type, RIC VIII Lyons 108, issued by Magnentius from Lyons in 350 AD, after he had just donned the purple in nearby Autun.
I think it's possible that this was really just Rome's version of the "phonenix on rocky mound" as issued by other mints. Tory's coin makes it look more nest-like than mound-like, but that's not always true. Here's a larger photo of "Tory's coin" from WildWinds, from whoever bought it. And here's one from Vienna looking much more mound-like. Compare to Vienna's one from Aquileia considered just as a mound. I've not been able to find any reference to it, but there must be come mythalogical basis to this association of the phoenix with a rocky perch/nest. Here's a 5thC AD mosaic in the Louvre, taken from Antioch, depicting the same scene.
@Heliodromus, I've never seen that Magnentius FEL TEMP before. Nice coin. Just to muddy the waters a little, here's a couple (worn, beat up) REPARATIO FEL TEMPs of Procopius (son of Precocius?). Hey, Latin experts, how does changing the order of the words affect the meaning? (Bronze) AE III Cyzicus mint, A.D. 365-366 Obv: D N PROCO-PIVS P F AVG Rev: REPARATI-O FEL TEMP - Emperor standing, facing right, holding labarum in right hand and resting left hand on shield SMKB in exergue RIC 9 16mm, 2.2g As above, but RIC 7 (left-facing bust) 17mm, 2.7g
Here is the other FEL TEMP REPARATIO type of Constantius II that is not common: 24 mm. 5.78 grams. Emperor standing left, holding Victory on globe and standard with chi-rho on left, captive below. Γ ✳ ✳TSB• RIC VIII 178 variety (Γ is not listed there, but it is for 172 which has a ✳ after TSB where 178 has a •, a minor difference). This type is only from Thessalonica. It was struck after Vetranio, with Gallus. In 1933 Harold Mattingly wrote an article "FEL. TEMP. REPARATIO" which was reprinted by Attic Books in 1977 (long before pdfs were on the web). Surprisingly, although intended to be comprehensive, it fails to list or illustrate this type, which is some evidence of its rarity.
Thought I'd throw in a silver type. Not the best ... but these are tough to find. Constantius II AR Siliqua, Arelate mint Obv: (Anepigraphic); Bust right with eyes turned upwards Rev: CONSTANTIVS AVGVSTVS; Victory advancing left holding wreath and palm, C(dot)S in exergue
I think this type is not the most uncommon but not exactly common too: Emperor Constantius II. - CONCORDIA MILITVM - Minted under the "usurper" Vetranio in Siscia
Here's another uncommon reverse type of Constantius II. The reverse legend refers to Constantine I's vision of the cross before his battle with Maxentius. (Bronze) AE3 Siscia mint, A.D. 350 Obv: D N CONSTAN-TIVS P F AVG Rev: HOC SIG-NO VICTOR ERIS - Emperor, standing, facing left, holding labarum (standard with Chi-Rho) being crowned by Victory •ΓSIS✳ in exergue; A in left field RIC 291 21mm, 3.8g.
Here's my, rather scruffy, phoenix on rocky mound, holding a branch in its talons: Constantius II, A.D. 337 - 361 AE3 Rome mint, A.D. 348-350 RIC 141 (Var., with branch) Obv: D N CONSTAN-TIVS P F AVG. Rev: FEL TEMP REPARATIO - Phoenix, radiate, standing, facing right, on rocky mound, holding branch in talons. R[T?] in exergue 19 mm, 2.6g