. . . is the steel ref 2366 . . .
. . . fitted with a Causmann dial from the '90s and a replacement crown. No movement image provided, but it should have a 30T2rg inside.
This one is the homage produced in the mid-'90s in yellow gold . . .
. . . and white.
(There was also a rose gold model. And a set of three enamel dials for Japan, also in precious metal.)
Omega found a stash of cal 269 movements which enabled them to produce this series . . .
. . . kinda like Patek did with their ref 5105. These homages mimicked the original 2366, but not down to the last detal, and the cal 269 movements were not rated. Miki J had one once upon a time, and Steve G has one. I believe a few other community members in the past had (or still have) one as well, notably MSNWatch and GatorCPA. One of the latter fitted a cal 30T2rg movement for what has to be the coolest hot rod of all time.
This one appears to be an authentic yellow gold ref 2366 (either 14 or 18 kt) . . .
. . . with, again, one of the Causmann dials produced in the '90s. I recall a mention from many years ago that Omega had service dials for their chronometer references in stock until roughly twenty years ago. It's likely, in my opinion, that dials Omega had in that time frame were made by Causmann. Genuine service dials from the '40s must've been exhausted well before then.
The others are hodge-podges. This one might be a '50s ref 2639 . . .
. . . with an adroitly-fitted Causmann dial, but there's no way of telling without movement and inner caseback images.