^^ I thought that about the threads as well, but I don't think it would have gone on that far if the threads were mismatched. The gap looks OK to me --- the largest two sprockets on that Oro screw on from the back, so there is no freewheel body extending beyond them like there is on my America. My Oro is in bits at the moment, so I can't take an equivalent picture (and I'm in France...)
I'm flummoxed.
Nick