I can go back to 1948 and the 1600F that was fitted with a focal plane shutter of 1/1600.
I used this camera in the early fifties in the Middle East. Then came the 1000F which was just a marketing ploy, this was replaced by the 500C with the Compur BTL Shutter to 1/500.
When they decided to introduce the new focussing screen they change the title to 500CM.
Any information required about any Hasselblad Sinar or Nikon, just shout.....