As we well know, the first Alarm Diving Watch was a Jaeger-Lecoultre, but not the one you are thinking about.
Indeed, it was not the Polaris, but the Deep Sea Alarm ( 1959 )
The second was not a Jaeger-Lecoultre, but a... Vulcain, the Cricket Nautical ( 1961 ), a watch I didn't have the pleasure to see in the real, till... Yesterday, when a good Purist and friend came in Paris wuth this marvel.
We also know that it was in 1963 that Jaeger-Lecoulte made the first protos of the Polaris, Protos which are very close to the Polaris 65, not to say identical.
Here are these two legands, side by side:
As you can see, the case ( Piquerez Super Compressor ) is the same, as well as the case back, which, on the Vulcain, always shows these famous 16 holes we don't systematically find on the Polaris 65, while they are systematically present on the Polaris 68.
The Vulcain Cricket Nautical case back:
One thing is sure: I have to get one, which I did already know, but seeing one in the flesh is a strong experience.
Best, and thanks to our Purist friend to have authorized me to take and post these pictures.