Studies and photos of Jaeger LeCoultre Caliber 849

If you're a watchmaker, the tech sheets and oiling charts can be found here:

http://www.phfactor.net/wtf/Jaeger%20Le%20Coultre%20Tech%20Sheets/1151_JLC%20849.pdf

Since I'm a movement nerd, naturally, I wanted to know everything about that little caliber residing inside my new Master Ultra thin. After scouring the internet, old catalogs, magazines, and JLC's press archives. I've dug up the following information and photographs. The two full reviews of the 849 movement are done by Walt Odets of Timezone (although actually of the 839 movement) and ei8htohms of PuristS (now PuristSPro).

TimeZone 839 Review
PuristS 849 Review

Please note that the macro photos are my own work and are free to use with proper credit:

Recto

Verso

Basic information:
Released in 1994
123 parts
19 rubies
Four bridge configuration
21,600 vph
1.85mm high
9''' (20.8 mm diameter)
KIF shock protection
Flat hairspring (Nivarox 1)
35 hour power reserve on one barrel
Other features: 2 armed stepped balance wheel, chamfered heat blued and polished screws, Cote de Geneve finish, Master Control 1000 hour QC, polished jewel and screw sinks.

Based on Caliber 839, which is based on caliber 838 (18 jewels, 121 parts, 3 bridge configuration)), which has its roots in the JLC ebauche for VC caliber 1003/AP 2003 (both 18 jewels, 1.64mm high, 18,000 vph, flat hairspring, 9''', 35 hour power reserve).

Used in (current as of SIHH 2013):
JLC Master Ultra Thin (33.4 mm, 4.2 mm high, measured by me to be closer to 34 mm by 6 mm due to domed sapphire, sapphire case back), Master Ultra Thin 38 (38 mm, 6.31 mm thick), Master Ultra Thin Jubilee (180 anniversary, 39 mm, platinum only, solid case back, 4.05 mm thick). Additionally, it is used in a variety of cases based on the first two mentioned, often with high jewelry design.

Below are scans from the 2002/2003 JLC "The Manufacture's Book of Timepieces"