amanico[JLC Moderator]
400090
CK 2777/2 Railmaster White.
A very short batch, made in 1955/1956, considered by some as a prototype of the CK 2914 Railmaster.
A sea snake, a myth, seen at the Omega Museum during my visit in 2018.
37 mm case, to be compared to the 38, 5 mm case of the CK 2914.
The movement is the Cal 283, manual winding.
For the comparison, a shot of the " normal " CK 2777:
And its caliber:
Best,
Nicolas