Interesting. I know American Arms imported Zabala-made guns, as well as a Grulla #2 which was their top of the line gun. Don't recall Parkemy associated with AA, but that was a long time ago and there were more Spanish makers around than there are now.
You're right. It was an error on my part. I mixed up two different guns I'd seen at shows. I knew ZH made the later Derby's imported by AA, but I incorrectly thought the earlier one's were made by APM. More of a memory lapse than anything, I'd researched the Derby's a couple of years ago..
Here's an Armas Parkemy I have, waiting it's turn to be restored.

Regards
Ken