Recently, I was able to acquire a left facing portrait variant of the type. Domitian Æ Obol, 2.80g Alexandria mint, 91-92 AD Obv: ΑΥΤ ΚΑΙϹΑΡ ΔΟΜΙΤ ϹƐΒ ΓƐΡΜ; Head of Domitian, laureate, l. Rev: LΙΑ; Sphinx, r. RPC 2646 (0 spec.). Emmett 326.11f. Dattari-Savio 571. Acquired from ebay, June 2022.
This one isn't a sphinx, but it's clearly inspired by the imagery of the sphinx. A dog (companion animal of Asclepius, who appears on obv.) from Epidauros: