Marc:
Thanks for your interest.
No, none of them has capture marks.
I imagine every power that capture foreign weapons keep a part of them unmarked in case they need to use them later on covert operation and exercise a PR denial.
In this case, weapons very similar to these became available around this area around the days of the Sandinista war.
I don't want to draw conclusions, but the posibility exist.
In any case, I pressume they lived an interesting life before we kept them sleeping in a drawer
Saludos and many thanks again.
(I can try to take a decent picture of the holsters, magazines and tool, in case you're interested)