Yeah, not a Gay Freres piece so no codes. We need a late pre-Appcalypse Zenith specialist. Veritas99?
It's hard to say for sure, given that Zenith had an assortment of unnamed models in the mid- to late-70s. The pattern on the first bracelet isn't as common and matches a 01.0030.380 from the mid-1970s: The second pattern is more common, but if I had to guess, I'd say it's off a late 70s Port Royal given the sharp taper: Veritas99