. . . and 2471 / 2473 were evident in lug design. All were 35 mm, distinguished by differing lug flair.
I've never owned a Cosmic, partly because calendar complications aren't personally compelling, but also because it seems to be the most difficult sub-type to collect owing to myriad dial configurations. I'm rarely certain if I'm looking at an original or a redial, at least not to the same degree with most other references.
Thanks for sharing your vintage Omega with us!
Art