Universal Geneve Cal 42

Looking for info on some Universal Geneves I’ve fallen in love with. I’ve picked up an 842101(pictured below) and an 842111, I’m on the hunt for an 842135.
I know that they’re from the 70s and the 8 and the 42 in the reference number refer to the case material (steel) and the cal. 42 movement respectively, and that the 842111 looks a lot like the white shadow by Gerald Genta. Any info or context would be appreciated.

Here’s a photo of the 842 111, I think you’ll agree it’s very similar to the white shadow.