1991-1997: The «Ingenieur Chrono Alarm»

The ref. 3815 and her relatives with meca-quartz movement (cal. 633 by JLC)

deutsche Version
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With the «Ingenieur Chrono Alarm» another variation of the Genta theme was launched in 1991, this time adding chronograph as well as alarm complications to the Ingenieur line. Thanks to its diameter of 34 mm and its military looking main dial, the «Chrono Alarm» gave a more adult impression than the prior «Chronograph» (ref. 3734).

The model range seems to have been quite effective. Nevertheless it was already missing from the catalogue beginning with 1998, most probably making way for the «Automatic Alarm» within then launched GST line. The «Chrono Alarm» was however still on stock, with the last pieces being delivered as late as 2000.

Like its sibling, «Ingenieur Chronograph», the «Chrono Alarm» was equipped with a meca-quartz movement belonging to the calibre 630. These hybrid calibres were produced by Jaeger-Le Coultre for IWC and combined quarz-controlled stepping motors with a mechanically driven chronograph. In the case of the Chrono Alarm's calibre 633, it was furthermore enhanced with an alarm function.

These days, the «Ingenieur Chrono Alarm» belongs to the most popular quartz models of the Ingenieur line, here and there even being regarded as a collector's item. The main reason is of course its calibre 633 which belongs the technical marvels among the quartz movements used by IWC.


Specifications:



picture

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reference name
movement
listed case

bracelet/strap

dials
measurements
remarks
3805 Ingenieur Chrono Alarm
cal. 633

meca-quartz

chronograph

date, alarm

1991-1997

(last sold in 2000)

stainless steel on steel bracelet

mixte (SS/18 ct. YG bezel) on steel bracelet+

black military

white

gilt

ø: 34 mm

h: 9mm

w: 99 g (SS/SS)

water resistant to 3 atm

amagnetic to 4,800 A/m

same watch on diamond bracelet
(ref. no. unknown)

mvmt. based on JLC cal. 630

3815 Ingenieur Chrono Alarm
cal. 633

meca-quartz

chronograph

date, alarm

1991-1996 stainless steel on leather strap

mixte (SS/18 ct. YG bezel) on leather strap

black military

white

gilt

ø: 34 mm

h: 8.8 mm

water resistant to 3 atm

amagnetic to 4,800 A/m

mvmt. based on JLC cal. 630

base reference 3815

9515 Ingenieur Chrono Alarm
cal. 633

meca-quartz

chronograph

date, alarm

1991-1996 18 ct. yellow gold on gold bracelet
black military

white

gilt

ø: 34 mm

h: 9mm

water resistant to 3 atm
amagnetic to 4,800 A/m
movement based on JLC cal. 630

same watch on diamond bracelet
(ref. no. unknown)

base reference 3508

9517 Ingenieur Chrono Alarm
cal. 633

meca-quartz

chronograph

date, alarm

ca. 1991-1996

(not listed)

18 ct. (white ?) gold on gold bracelet with diamonds on bezel
black military

white

gilt

ø: 34 mm

h: 9mm

water resistant to 3 atm
amagnetic to 4,800 A/m

movement based on JLC cal. 630

same watch on diamond bracelet
(ref. no. unknown)

base reference 3508

 

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