based on JLC cal 906 (launched in the 70s and used in few models)
VC modified the JLC base by adding a hacking seconds and replaced the plastic parts with steel ones:
The VC cal 1096 was used in the ref 2215 which you mentioned (a rectangular Chronometre Royal) and the ref 42011 (scan courtesy of Antiquorum). I need to check if other references also used this caliber.
From a google search, the JLC movement had these specs:
Caliber: 906, hack, 28800 vph, 21 jewels, certified chronometer. Date of manufacture: 1974
Seems it was constructed as a chronometer movement, which implies inherent timekeeping qualities.
Just not aesthetic ones
as it was until quite recently, when the caseback was in gold and not sapphire
I mean, look at this beautiful, late Medicus,
And then at the back, which is terrible !
I always wondered why they put a sapphire to show this, a terrible cheap movement,
which is a workhorse and is the same as in the Omega Speedmaster,
but at least on the the Speedy,
you don't have to see the movement....
OK, that is a bit disappointing, as hundreds of other models share this movement and cost much less
finish was pretty good but having a non comumn wheel chrono movement was just not up to par with what you could expect from VC
personally, it will haunt me.
me. Even if the movement was hid from view I would still know its in there and still a no no for me.