[CR]solve the mystery of the Regina thread!

Hi gang, Easy question for the experts: how do I tell what thread type is on a Regina Gran Sport Oro 5 speed freewheel? There is little marking on the freewheel itself. On the lockring, it says "REGINA G.S. ORO - S*I*C*C* MERATE -->", and on the back are two letters stamped into the steel. Might say "F.I.", but it's a tough call. Photos of the freewheel and box are at: http://albums.photopoint.com/j/AlbumIndex?u=1487297&a=11578970 My hubs are all English, and I don't have the nerve to just try threading it on.

thanks, Steve Kurt Peoria, IL (how much do 'ya figure I'd get for the box on eBay??)