I'm mainly a revolver guy, so I had to look it up.
Roughly speaking for autoloaders the 2 digits, i.e., 59, were the 1st generation, 3 digits were 2nd gen and 4 digits are 3 gen. I think they're pretty much all gone with the only vestige being the SD9/40 and of course the SW1911. I don't think they have a true DA/SA in the catalog anymore. Could be wrong. Frequently am.