====== JLC 497 ======
The **JLC 497** is an [[automatic]] movement from [[Jaeger-LeCoultre]].

===== Cal. 497 and 827 =====
Calibre 497 debuted with the [[Jaeger-LeCoultre Futurematic|Jaeger-LeCoultre Futurematic Ref. E 501]] and was much more advanced than the earlier [[Jaeger-LeCoultre 476|Cal. 476]]/[[JLC 481|Cal. 481]]. It features a larger balance for improved accuracy and [[hacking seconds]]. One unique feature is a lock that holds the swinging weight in place when the mainspring is fully wound. It also features a special 6 hour power reserve, allowing the watch to immediately function when it is put on, rather than requiring it to be wound first.

The Calibre 497 featured a [[power reserve indicator]] along with [[small seconds]] located at the unusual position of 3 00.

Approximately 52,500 examples of Calibre 497 were produced between [[1951]] and [[1958]]. **Calibre 827** was quite similar, incorporating some changes from Cal. 817/837, and about 1,000 examples were made.

===== Calibres 817 and 837 =====
**Calibre 817** was used in the [[Jaeger-LeCoultre Futurematic|Futurematic Ref. E 502]] from [[1956]] and was a modification of the existing Calibre 497. Like that movement, it has a [[power reserve indicator]] at 9 00 and [[small seconds]] 3 00, but in Cal. 817 and **Cal. 837** these are tiny round windows rather than being full [[subdial]]s. The power reserve uses a paddle-shaped indicator attached to the catch for the bumper rotor. It was a much-simpler display, half white and half red on Cal. 817 and black and white on Cal. 837. And the seconds disc has a simple arrow and no other markings.

Calibres 817 and 837 were produced from [[1956]] through [[1958]], with about 3,000 of Cal. 817 and just 500 of Cal. 837 made.

===== External links =====
  * [[http://jlc.watchprosite.com/show-forumpost/fi-2/pi-5969083/ti-875793/s-0/|An interesting page of JLC history: Automatic watches]]
  * [[http://www.network54.com/Forum/234648/thread/1046348836/Futurematic+trivia---|Futurematic trivia...]]


<WRAP ud ud_mov>

**Manufacturer:**
  * [[Jaeger-LeCoultre]]

**Description:**
  * [[Bumper]] [[automatic]] movement

**Functions:**
  * Hour, minute hands
  * [[Small seconds]] at 3 00
  * [[Power reserve indicator]] dial at 9 00

**Data:**
  * 13 3/4 [[ligne]] (31.3 mm)
  * Height 6.3 mm 
  * Balance 2-spoke [[Glucydur]] with adjustment screws
  * Balance Spring [[Nivarox]] spiral 
  * [[KIF]] shock absorbers
  * 17 [[jewels]]
  * 18,000 A/h
  * Power reserve 40 hours

**Production period:**
  * Predecessor [[JLC 481]]
  * Production [[1951]]-[[1958]]
</WRAP>

{{tag>Movements Automatic_movements Bumper_movements Jaeger-LeCoultre_calibres}}