Jaeger-LeCoultre rare Prototype "Unsaleable" Automatik Chronometer Kal. 906

A rare gentleman's wristwatch
with central seconds
and hack feature
Jaeger-LeCoultre
"Prototype - Unsaleable"
Automatik
caliber 906
with day- and date indication

Particularly interesting and extremely rare is this offered Prototype model of Jaeger LeCoultre with central seconds and "inner diamond", automatic Chronometer caliber 906. The movement is equipped with hack feature, the movement picture shows the remarkable seconds stop mechanism made of molded green plastic, when the crown is pulled out, the central second stops.
A total of 7000 pieses of Jaeger LeCoultre caliber 906 where manufactured from 1973 to 1975, of which many were supplied to Vacheron & Constantin as Ebauche to power their "Chronometre Royale" series of wrist chronometer.

Details on the watch:
Dial
bronze, structured
applied indexes
central seconds
baton hands
day- and date indication
signed
good condition

Movement
rotor wind movement
Jaeger LeCoultre caliber 906
rhodium plated
hack feature
3 adjustments
17 Jewels
Glucydur screw balance
Incabloc shock protection
signed
the movement is is fully functional and running very well

Case
steel
screwed back
diameter approx. 38mm without crown
length approx. 43mm
engraved "Prototype - Unsaleable-Hors Vente-Ausser Verkauf"
good condition

Bracelet
neutral leather bracelet with buckle
The watch is fully functional, is running very well and is in a good, used condition.