Seamaster - De Ville: the De Ville line started as a subline of Seamaster, and dials were co-signed
Seamaster - Speedmaster: The Speedmaster was born as a child of the Seamaster, even if the dial was never co-signed. Omega decided to keep the logo
Interestingly, the tachymeter scale was called a "tacho-productometer"
Others, no real idea...
- The Railmaster is listed by Omega as part of the Seamaster line, maybe that is why. So when the trilogy was presented in 1957, it was a Seamaster Trilogy: 1 for deep-diving, 1 for rail-diving, and 1 for Moon-diving
😁
- The Seamaster - Geneve is really weird to me... I thought Geneve started earlier than Seamaster and that it was their flagship line before the Constellation was created
- Seamaster - Constellation: maybe they handle those vintages as part of the same category on their computer system? If correct, it would be more correct to write Seamaster/Constellation but software usually do not like '/' (it should, but it doesn't)
edit:
- Seamaster with no seamaster logo: found the answer in another video of the watchonista series: Seamaster was the first line, then comes the Constellation, then the Ladymatic. When Constellation arrived, they thought a logo was needed to differenciate the lines. But the Seamaster only got its logo in 1956-1957, after the 2 others
