yeah, that Mantua Model e-mail is part of the UK-based operation.
The Italy-based OPS plant is also listed as “Mantua Model” on their Facebook page (I list the link above).
So there are two different Mantua websites and operations (one in UK, and the OPS plant in Italy). It’s confusing. I believe he (“Mantua” himself) is the owner of both.
When you message Mantua Model through the Facebook link it goes directly to the OPS plant. Massimo (“Max”) is the operation manager, he knows all the OPS product technical details.
I inquired, back in May 2022, about the new OPS .45 marine engine, Max provided this link (to purchase direct from Italy):
https://www.mantuamodelshop.com/motore-ops-45-marino-2017-6920.html