Hi Joao.
The Seamaster De Ville is from the mid 60's and probably has a caliber 562 inside. The bezel and crystal lift off, the stem is split, and then the dial and movement come out the front. "Seamaster" and "De Ville" were only put together on dials from 1963 through 1967 primarily because it was popular in the US market. Your watch looks completely correct - dial, hands, crown, etc.
The other Omega is a 40's watch with a manual wind 30 series caliber. Can't tell if the dial is original or refinished from those pics, but either way it's a nice watch and an heirloom to boot.
I'm not so good with pre-1952 Omegas so maybe somebody else could chime in.
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