Mike, there must have been a period of time when the 200 series became the 300 series, then back to 200's again. They are basically the same swivel base machinist vises, with a few minor changes over the years. I think only businesses buy new ones, because most of us would buy a pretty good gun or two with the money.
The Reed C series, 1C,2C,3C & 4C were the combination vises with pipe jaws.
If you would like to see a 1979 catalog, PM me your email and I will send it.