What is known about this 1980’s mystery “Calypso”

Hi all,

I picked up this Seamaster 120 a few years ago on a whim. I was drawn in by the PloProf style hand combined with the general condition of the watch and the fact that I hadn’t seen this combination.

I’ve been wearing it in rotation for about 2 years and my curiosity is officially piqued! This seems to be one of the many “Calypso” style references from the 80’s. Does anyone have any more detail or insight about this model? I haven’t been able to find another in this condition - it looks like NOS.

Magnificent! Hope you still have the watch.
I recently came across this Omega Catalogue page from 1982. I'm trying to establish the differences between Calypso I II & III models. The only solid info so far is Cal 1337 (push button setting & thicker 10mm case) is earlier, & Cal 1432 (standard crown setting & 6mm case) is later.