I've owned this 1951 Gubelin triple date for over 30 years. I bought it at Gubelin in Luzern, Switzerland after their master watchmaker completely overhauled it. The dial was refinished but they had the stamp to replicate the date track. It's in an all 18k gold case which is somewhat rare as most had steel backs. It has the Felsa Bydinator movement.
The other watch is a Vacheron Constantin Toledo which is a re-edition of their classic 1952 version which was huge for that era. 18k white gold with JLC based movement.
And both have classic solid backs.