So I've been doing some research on Zeniths recently & really like the tri-colored dials. The earliest samples from the late 60s/early 70s had minimally overlapping subdials such that they were 100% legible. The 38mm modern day is also legible but I prefer a size of 40mm. Was there ever a 40mm legible tri-color El Primero?
The 'piece on the left is the modern day version with significantly overlapping dials such that the markers are 'covered' up. The 'piece on the right's subdials are entirely legible.