Thanks everyone for your answers.
@ewomack @Curtis JJ I took a (long) look at Sear 162, MIB 88, DOC type 32 and those coins are exclusively from the 5th officina (Є). May be the production of the 3rd officina (Γ) for that type is so rare the officina is unlisted. The question of the "style" remain.
@ela126 Nice find, happy to see there is another specimen out there! I went through the "Catalogue of the Coins of the Vandals, Ostrogoths and Lombards and of the empires of Thessalonica, Nicaea and Trebizond in the British Museum" to learn about germanic coinnage, it's true many coins have similar style/portrait. It's also interesting the people at TimeLine Auctions couldn't decide if it was from Constantinople or Ravenna, Greek or Germanic.
@Tejas Imo the engraving looks too meticulous to fall in the category you mentioned (but it's still a possiblity).
I'm even more confused now 😅
PS: Sorry for my english