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The 12023 special editions of the Cosmonaute are among the rare Breitling models to have see-through casebacks. Those were apparently produced in less than 3,000 pieces, from 1993(?) to 1997(?).
There are several known versions for this chronograph:
Cosmonaute A12023 with see-through caseback
suggest, these watches use the Lemania-based
Breitling Caliber 12 movement,
and are not chronometer-certified.
Please note that the Lemania movement used by Breitling at this time can come with either 17 or 18 jewels, and with different colors of wheels.
This watch should not be confused with the A12021, a very similar watch which was produced shortly before, but was limited to the Japanese market.
The particularity of the “série spéciale” 12023 Cosmonaute, compared to the 12022, its otherwise twin sister, is the display back. This piece of glass allows the movement to be admired, as well as seeing the gears working and the pushers' actions.
This kind of caseback is more often found on manual-wind movements; the current automatic 22322 Cosmonaute has no display-back, mainly because an automatic movement is visually less appealing.
The back of the case shows:
Cosmonaute Série Spéciale Étanche 30 M,
as well as the reference number and the serial number,
which is 4 digits long (denoting a relatively small production).
Any feedback to help solve these questions would be greatly appreciated!
With many thanks to Elwyn Perser!