your father's Dixons were 100% made in Italy by UFIP.
There were two unrelated uses of the name Dynastar for cymbals that I am aware of.
In the early 1960s the US distributor (this is prior to Ludwig dist. Paiste) of Paiste Formula 602s (Bonne Music Center aka Halifax Dist. Co. of Syracuse, NY) used the name Dynastar Formula 602s by Paiste for the cymbals and got a special metal stamp like Arbiter did for 602s sold at Drum City in London.
In the early to mid 1970s UFIP made the DynaStar Dixon and DynaStar Superior for WERCO - a Chicago area musical instruments maker and distributor.
I attached a photo of a different Dixon that partially shows the "Italy" engraving on the cymbal underneath the name.