The second Ingenieur generation with cal. 854x

Specifications:

automatic movement calibre 854x with Pellaton winding mechanism
- IWC inhouse production
  - calibre 854/854B: without date indication (854 with IWC type collet, 854B with Greiner type collet)
  - calibre 8541/8541B: with date indication (8541 with IWC type collet, 8541B with Greiner type collet)
- diameter: 28 mm
- movement height:
  - calibre 854/854B: 4.85 mm
  - calibre 8541/8541B: 5.8.8 mm
- number of jewels: 21
- frequency: 19,800 A/h = 2.75 Hz
- balance overcoil: Breguet overcoil
- fine adjustment: IWC fine adjustments
- surface: nickel plated
- total production (only a small part used for Ingenieur models)
  - calibre 854/854B: ca. 43,200 pieces
  - caliber 8541/8541B: ca. 158,400 pieces
tripartite screwed case, water resistant to 12 atm
- middle part of case: polished
- top part with bezel: polished
- bottom part with forteen angles (for screwing tool), central cercle with circular grinding
- amagnetic to 80,000 A/m, movement protected by Farraday's cage made of soft iron inner case and soft iron dial bottom
- glass: Plexi
case number on outside of case bottom at the edge of the central circle or inside of case bottom
Ingenieur-Logo above index at 6
part of production with applied IWC-Logo below index at 12
straps and bracelets
- leather/croco
- steel: Reference 10
- steel and gold: Reference 11

reference	name	movement	listed	case bracelet/strap	dials	measurements	remarks
866 A (= 1908)	Ingenieur Automatic	cal. 854 cal. 854B automatic	1967-1970 1970-1976	stainless steel on croco strap stainless steel on steel bracelet 18 ct. gold on croco strap	anthracite gilt sunray silvered sunray [black, blue]	ø: 37 mm h: 13.2 mm	water resistant to 12 atm (gold model 6 atm) amagnetic to 80,000 A/m identical with ref. 1908 of new reference numbering scheme
866 AD (= 1808)	Ingenieur Automatic Calendar	cal. 8541 cal. 8541B automatic date	1967-1970 1970-1976	stainless steel on croco strap stainless steel on steel bracelet 18 ct. gold on croco strap	blue sunray gilt sunray silvered sunray anthracite [black]	ø: 37 mm h: 13.2 mm w: 56 g (SS/strap) 98 g (SS/SS)	water resistant to 12 atm (gold model 6 atm) amagnetic to 80,000 A/m identical with ref. 1808 of new reference numbering scheme
9120 A	Ingenieur Automatic	cal. 854 cal. 854B automatic	1967/68-1969	18 ct. yellow gold on gold bracelet	silvered sunray gilt sunray anthracite [black]	ø: 37 mm h: 13.2 mm	water resistant to 6 atm amagnetic to 80,000 A/m base reference 866 A=1908
9120 AD	Ingenieur Automatic Calendar	cal. 8541 cal. 8541B automatic date	1967/68-1969	18 ct. yellow gold on gold bracelet	blue sunray gilt sunray silvered sunray anthracite [black]	ø: 37 mm h: 13.2 mm	water resistant to 6 atm amagnetic to 80,000 A/m base reference 866 AD=1808

picture

(click on thumbnail
for enlarged version)

reference

name

movement

listed

case

bracelet/strap

dials

measurements

remarks

866 A

(= 1908)

Ingenieur Automatic

cal. 854

cal. 854B

automatic

1967-1970

1970-1976

stainless steel on croco strap

stainless steel on steel bracelet

18 ct. gold on croco strap

anthracite

gilt sunray

silvered sunray

[black, blue]

ø: 37 mm

h: 13.2 mm

water resistant to 12 atm
(gold model 6 atm)

amagnetic to 80,000 A/m

identical with ref. 1908
of new reference numbering scheme

866 AD

(= 1808)

Ingenieur Automatic Calendar

cal. 8541

cal. 8541B

automatic

date

1967-1970

1970-1976

stainless steel on croco strap

stainless steel on steel bracelet

18 ct. gold on croco strap

blue sunray

gilt sunray

silvered sunray

anthracite [black]

ø: 37 mm

h: 13.2 mm

w: 56 g (SS/strap)
98 g (SS/SS)

water resistant to 12 atm
(gold model 6 atm)

amagnetic to 80,000 A/m

identical with ref. 1808 of new
reference numbering scheme

9120 A

Ingenieur Automatic

cal. 854

cal. 854B

automatic

1967/68-1969

18 ct. yellow gold on gold bracelet

silvered sunray

gilt sunray

anthracite

[black]

ø: 37 mm

h: 13.2 mm

water resistant to 6 atm

amagnetic to 80,000 A/m

base reference 866 A=1908

9120 AD

Ingenieur Automatic Calendar

cal. 8541

cal. 8541B

automatic

date

1967/68-1969

18 ct. yellow gold on gold bracelet

blue sunray

gilt sunray

silvered sunray

anthracite [black]

ø: 37 mm

h: 13.2 mm

water resistant to 6 atm

amagnetic to 80,000 A/m

base reference 866 AD=1808

Shortly after 1971 IWC introduced the new scheme for referencing their watches which is still the basis for the one currently in use. At its introduction, a certain range of numbers was reserved for each calibre. Thus the reference 866 AD with calibre 8541 became the reference 1808, while the reference 866 A with calibre 854 got the reference 1908. The gold Ingenieurs with gold bracelets disappeared from the catalogues, and no new numbers seem to have been allocated to them. The remaining models however were not changed, and for a few years, the old and new numbers were used in parallel.

picture (click on thumbnail for enlarged version)	reference	name	movement	listed	case bracelet/strap	dials	measurements	remarks
	1808 (= 866 AD)	Ingenieur Automatic Calendar	cal. 8541B automatic date	1970-1976	stainless steel on leather strap stainless steel on steel bracelet 18 ct. gold on leather strap	blue sunray gilt sunray silvered sunray (anthracite, black)	ø: 37 mm h: 13.2 mm w: 56 g (SS/strap) 98 g (SS/SS)	water resistant to 12 atm (gold model 6 atm) amagnetic to 80,000 A/m identical with ref. 866 AD of old reference numbering scheme
	1908 (= 866 A)	Ingenieur Automatic	cal. 854B automatic	1970-1976	stainless steel on leather strap stainless steel on steel bracelet 18 ct. gold on leather strap	anthracite gilt sunray silvered sunray [black, blue]	ø: 37 mm h: 13.2 mm	water resistant to 12 atm (gold model 6 atm) amagnetic to 80,000 A/m identical with ref. 866 A of old numbering scheme

picture

(click on thumbnail
for enlarged version)

reference

name

movement

listed

case

bracelet/strap

dials

measurements

remarks

1808

(= 866 AD)

Ingenieur Automatic Calendar

cal. 8541B

automatic

date

1970-1976

stainless steel on leather strap

stainless steel on steel bracelet

18 ct. gold on leather strap

blue sunray

gilt sunray

silvered sunray

(anthracite, black)

ø: 37 mm

h: 13.2 mm

w: 56 g (SS/strap)
98 g (SS/SS)

water resistant to 12 atm
(gold model 6 atm)

amagnetic to 80,000 A/m

identical with ref. 866 AD of old
reference numbering scheme

1908

(= 866 A)

Ingenieur Automatic

cal. 854B

automatic

1970-1976

stainless steel on leather strap

stainless steel on steel bracelet

18 ct. gold on leather strap

anthracite

gilt sunray

silvered sunray

[black, blue]

ø: 37 mm

h: 13.2 mm

water resistant to 12 atm
(gold model 6 atm)

amagnetic to 80,000 A/m

identical with ref. 866 A
of old numbering scheme

	1967-1976: The second Ingenieur generation The ref. 866 (later 1808) and her relatives with IWC automatic (cal. 854x)	deutsche Version
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The second Ingenieur generation according to old numbering scheme (1967-1971)

The second Ingenieur generation according to new numbering scheme (1971/72-1976)