Happy to upload the wider picture here.

On the left we have the reference 3150 , produced from 1949-1952, the very first alarm Memovox reference , Charlie Chaplin owned the same reference. Just gorgeous and ahead of anything in terms of size and design for 1940's. Designed to be an iconic shape , only to be slept on.
To it's right , reference E876, though these are not documented well my research shows a long production going from 1969 to about 1975 for mere 700 dials in blue. The first generation having tritium triangle for an alarm pointer , versus the later having an applied metal triangle. These predate other Memovoxes using the 916 caliber , which was the first and high beat automatic alarm caliber in the world beating at 28,880 beats per hour.
The Ellipse faced trio are reference E872, until you have seen them in the flesh the pictures do zero justice. The Middle one with the applied HPG logo on a Jaeger dial signifies first year of production in 1970, and it stands for High Precision Grade, which meant a whole 31 day regulation going beyond chronometre standards of then. We are talking 42mm size , waterproof screwdown caseback and incredible frost finished end links.. A movement and a watch that came out 6 years prior to the first nautilus that rocked a JLC movement without an alarm complication. An incredible original , sporty design.
On the top right we have the reference E861. Interesting called "Speed beat" while rocking the 18,000 BPH , caliber 825 bumper movement. This was because the case design of the watch at the time was inspired by high speed design, often original adverts being next to Concord planes and "Grand Turismo" Opel automobiles. Quite significant , as this is the very first non classical round , but funky , bold and sporty memovox. Prior to this all memovoxes have never been funky.
Conclusion
Is this the greatest monetary value vintage memovox collection out there? Hell no. Having owned the now hyped up vintage Polaris memovox for datejust money , and the LBJ worldtimer memovox , i can comfortably say I find more joy in owning , collecting and helping other collectors get references like these that are much more slept on , and only when you dig deep , research the historical times in context with the certain piece , then you find they are so much more special than some standard compressor case.
All of this belongs in a museum
Fantastic write up 💙