I have a half-lug stainless .38 made in the early 1990s. The story I got with it (for free!) is that it was an over-run from a batch done for US Customs before it became ICE after 9/11. Since it has no LEA markings, I've always doubted that, but it's an excellent shooter, so I've kept it, history or no.
I BELIEVE that most GP .38s were either made for US government or LEA use when .38s were the issue caliber, or were intended for export to countries where .38 Special is the largest caliber allowed for civilians and a common private security guard weapon caliber. That doesn't make it true.
But I've seen GPs carried by private security AND government anti-terrorist cops in France and by security in Italy and Latin America. The French ones were .357s; the rest .38s, as far as I could tell. Asking a cop, especially the CRS in France, about his weapon is a kinda risky business....
Some of the recent .38s that have dribbled out from Ruger may just be a cleanup of existing parts, knowing that us "Jeep" nuts will scoop 'em up!
All of these early GPs are scarce in CA because of our stupid/insane "safe gun list" requirements. None of them are C&R, so they are too dangerous to "import" from other states (new ones aren't). BUT (the big butt), if you're MOVING here and own one, you can bring it in as long as you get a background check in a short period after you show up. And take the state gun safety test (a joke to any serious shooter), and pay the state for both.
Mine must have been "imported" before the stupid list went into force. It passed background check fine, and so did I. Our mandatory background check is called "DROS," rhymes with "gross." Nobody knows what that means.