Back in the early 50s Omega's flagship was the Constellation, all chromometers and initially at least all bumper automatics. The Seamasters were (mostly) non-chronometers in slightly more sporty/casual chunkier cases rather than the more elegant and elaborate cases in the Constellations. The bumpers were made in non-date versions (used in the Constellation) and date versions (Cal 353/355) which were used in the date version Seamasters, the date versions were never made as chronometers, and as such there are no bumper Constellations with date, only Seamasters.
As it was the only automatic with date Omega had at the time Omega did make quite a few of these date at six Seamasters until they released the Cal 503/504 with date in a full rotor automatic in the mid 50s.
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