Same model? (01:03:04) xxxx RD 75 is a plate number from the first half of 1965. If genuine. BSA?
BSA yes. Maybe A7 rather than A10 from the small front brake? I see from the thumb pic that they have plunger rear suspension so date is late 1940s/early 1950s - not later than 1954. I don't think we can see enough detail to determine whether or not they are from pre 1949 redesign or after.