Gallienus Milan mint not in MIR

Hello!
I bought this coin some days ago:



D\ [IMP] GALLIENVS P AVG
R\ IOVI C[O]NSERVAT, /P
21mm; 2.40g

I've not found this type in MIR, it seems to be a var. of the Goebl 1186e:



but the Goebl list a different obverse legend, the short IMP GALLIENVS AVG (without P).

I've tried to catch it into Doyen thesis "L'Atelier de Milan 258-268", but I've not found it.

What do you think about it?
Many thanks to all!

Salut, je l'ai montré à Jean-marc, voici sa réponse :
"Merci ! Il y a dans ma thèse (n° 776) un type identique (connu par 2 ex.), mais sans le T à CONSERVAT. Variété nouvelle qui devient 776bis."

Merci Cédric! And "salut" to Jean-Marc!
Alberto