Update:
-) there was NO identification on the prop, neither the hub nor the blades bore any marks whatever. Not even the maker's logo.
-) the reduction gearbox has been opened, and it was assessed by a person I judge competent to be undamaged. We found it is the type prepared to take a prop governor, though it doesn't carry one; and it also has the slipper clutch.
I was a bit surprised to get very prompt and useful replies to my e-mail inquiries at the manufacturer's (they had remained silent on earlier occasions); and they quoted me quite a fair price for the replacement propeller and the parts for the nose leg. So that on Thursday next I will start my old van for almost its last big trip: some 1600 kms to Eger, Hungary.
I'd rather have been flying, though...