The Case of the Mystery Screen Print Panel

My boyfriend recently acquired this crazy vintage screen print panel

and I immediately set out to try to learn more about it. Now I hate to toot my own horn, but I could make a sizeable part-time income as a professional internet searcher-- I am excellent at the Google. I thought I'd find information right away because its huge and really bold.

I poured over Pop and Op art screen printers and vintage textiles. I searched every single visual characteristic and visited countless pages on retro home decor. Eventually I gave up because this panel just didn't provide me with enough clues-- not signed, dated, titled. It was stretched well, but not professionally. So I'd totally given up and resigned myself to the fact that we'd always have this weird print we knew nothing about laying around.

Then today I casually opened up my Apartment Therapy SF Feed (I don't typically even visit the Apartment Therapy blogs because they go up so often its virtually impossible) and I saw
this!

The exact same print! Well almost-- this one doesn't have that extra set of lines that ours does-- so I'm guessing its a little shorter. To see this ever so serendipitously after combing the internet for hours days earlier really freaked me out.

I've emailed the apartment's owner (an Apartment Therapy contributor) and am hoping she can help me solve the mystery. I imagine she probably found it rather haphazardly too, but you never know.