Got one. Cant recall the prefix off hand at the moment but i do recall when i looked it up it was first year of import. Id say mine may be less than 100 rounds based on lack of any barrel wear. Its still sporting the original internals as well. Have original paperwork with it as well.
I've got a G19 that Glock told me was a gen 1. Their records showed it entered the US in July of 1987. It's SN is DSxxx. I have the original Tupperware, U-mags, brush, and manual. It was a service sidearm for a long time. It's well broken in and I can still hit 1 lb Coleman propane cans at 40 yards with it.