Omega Speedmaster Mark IV.5 Ref. 176.0012 circa 1978
Omega Speedmaster Mark IV.5 Ref. 176.0012 circa 1978
Omega Speedmaster Mark IV.5 Ref. 176.0012 circa 1978 | steel automatic chronograph wristwatch
Omega Speedmaster Mark IV.5 Ref. 176.0012 circa 1978 | steel automatic chronograph wristwatch
Omega Speedmaster Mark IV.5 Ref. 176.0012 circa 1978 | steel automatic chronograph wristwatch
Omega Speedmaster Mark IV.5 Ref. 176.0012 circa 1978 | steel automatic chronograph wristwatch
Omega Speedmaster Mark IV.5 Ref. 176.0012 circa 1978 | steel automatic chronograph wristwatch
Omega Speedmaster Mark IV.5 Ref. 176.0012 circa 1978 | steel automatic chronograph wristwatch
Omega Speedmaster Mark IV.5 Ref. 176.0012 circa 1978 | steel automatic chronograph wristwatch
Omega Speedmaster Mark IV.5 Ref. 176.0012 circa 1978 | steel automatic chronograph wristwatch
Omega Speedmaster Mark IV.5 Ref. 176.0012 circa 1978 | steel automatic chronograph wristwatch

Omega Speedmaster Mark IV.5 Ref. 176.0012 circa 1978 | steel automatic chronograph wristwatch

Omega released the Omega Speedmaster IV.5 in 1974. Bearing similarities to its predecessors, the Mark III (launched 1971) and Mark IV (launched 1973), the Mark IV.5 introduced an additional aperture to indicate the days of the week. The dial’s design was also adjusted, adding an extra subsidiary dial which allowed the separation of the 24-hour indicator from the constant seconds indication – a feature that had previously been combined on one subsidiary dial. This additional subsidiary dial was placed at the 12 o’clock position and, consequently, the Omega signature and model legend were moved, respectively, above and below the twin apertures for day and date indication at 3 o’clock. The chronograph’s minute recording hand is fitted to the dial’s centre and features a winged tip to clearly delineate it from the other central hands. Beneath the baton indexes for the hours, there are Arabic numerals for the five minute markers and these, with the addition of the outer track with divisions for minutes and seconds, allow the chronograph readings to be easily taken. As the chronograph minute recording hand is set to the centre and read to the scales at the edge of the dial, there is of course no subsidiary minute recording dial and the space this creates is taken by the day and date apertures. To the base of the dial is a chronograph hour recording dial, the sub dial at 9 o’clock displays constant seconds and the dial at 12 o’clock is a 24-hour dial grey sector for daytime hours. The watch is fitted to its original model 1162 bracelet and there is some stretch to the links. There is provision for quick calendar adjustment – when the crown is pulled out to its first setting, rolling the crown away from the user advances the date and rolling towards the user advances the days of the week.

Technical details

[M] Omega calibre 1045 automatic movement, lever escapement, 17 jewels, mono-metallic balance, 28,800 BPH, Kif Ultra-Flex shock absorber
[D] matt black dial, luminescent baton indexes, Arabic five minute markers, white luminescent hour and minute hands, central white chronograph seconds hand and winged chronograph minute recording hand, two apertures for day and date indication, three subsidiary dials for 24-hour register with grey banding for daytime hours, subsidiary dials for 12-hour recording and constant/subsidiary seconds, outer white track for minutes/chronograph seconds, inner bezel fitted to the crystal with tachymeter scale
[C] large stainless steel tonneau form case with satin finished bezel and polished upper rim to hold the crystal, screw-down satin finished case back centred with the Omega Seahorse emblem, Omega crown
[B] detachable stainless steel Omega model 1162 satin finished link bracelet with adjustable folding clasp and 172 end links
[S] case, dial, movement, crown and bracelet signed

Measurements

42mm width excluding crown
45mm length
15mm depth to centre of crystal
22mm lug gauge
200mm maximum bracelet length

Accompaniments

1 year guarantee
Serviced prior to our acquisition – checked, timed and tested by our watchmakers
Black Bough leather watch pouch and Black Bough certificate

£2,450.00

Out of stock

SKU: WYOSDD Categories: , Brand:

Description

41920408

Omega Speedmaster Mark IV.5 Ref. 176.0012 circa 1978 | steel automatic chronograph wristwatch

Omega released the Omega Speedmaster IV.5 in 1974. Bearing similarities to its predecessors, the Mark III (launched 1971) and Mark IV (launched 1973), the Mark IV.5 introduced an additional aperture to indicate the days of the week. The dial’s design was also adjusted, adding an extra subsidiary dial which allowed the separation of the 24-hour indicator from the constant seconds indication – a feature that had previously been combined on one subsidiary dial. This additional subsidiary dial was placed at the 12 o’clock position and, consequently, the Omega signature and model legend were moved, respectively, above and below the twin apertures for day and date indication at 3 o’clock. The chronograph’s minute recording hand is fitted to the dial’s centre and features a winged tip to clearly delineate it from the other central hands. Beneath the baton indexes for the hours, there are Arabic numerals for the five minute markers and these, with the addition of the outer track with divisions for minutes and seconds, allow the chronograph readings to be easily taken. As the chronograph minute recording hand is set to the centre and read to the scales at the edge of the dial, there is of course no subsidiary minute recording dial and the space this creates is taken by the day and date apertures. To the base of the dial is a chronograph hour recording dial, the sub dial at 9 o’clock displays constant seconds and the dial at 12 o’clock is a 24-hour dial grey sector for daytime hours. The watch is fitted to its original model 1162 bracelet and there is some stretch to the links. There is provision for quick calendar adjustment – when the crown is pulled out to its first setting, rolling the crown away from the user advances the date and rolling towards the user advances the days of the week.

Technical details

[M] Omega calibre 1045 automatic movement, lever escapement, 17 jewels, mono-metallic balance, 28,800 BPH, Kif Ultra-Flex shock absorber
[D] matt black dial, luminescent baton indexes, Arabic five minute markers, white luminescent hour and minute hands, central white chronograph seconds hand and winged chronograph minute recording hand, two apertures for day and date indication, three subsidiary dials for 24-hour register with grey banding for daytime hours, subsidiary dials for 12-hour recording and constant/subsidiary seconds, outer white track for minutes/chronograph seconds, inner bezel fitted to the crystal with tachymeter scale
[C] large stainless steel tonneau form case with satin finished bezel and polished upper rim to hold the crystal, screw-down satin finished case back centred with the Omega Seahorse emblem, Omega crown
[B] detachable stainless steel Omega model 1162 satin finished link bracelet with adjustable folding clasp and 172 end links
[S] case, dial, movement, crown and bracelet signed

Measurements

42mm width excluding crown
45mm length
15mm depth to centre of crystal
22mm lug gauge
200mm maximum bracelet length

Accompaniments

1 year guarantee
Serviced prior to our acquisition – checked, timed and tested by our watchmakers
Black Bough leather watch pouch and Black Bough certificate