====== IWC Ingenieur SL 3303 ======
  *See Also [[IWC Ingenieur]]

{{wst>image_cr|IWC|Ingenieur SL|IWC Ingenieur SL}}

The **Ingenieur SL Quartz** (Ref. 3303, 9701, and 9720) was the last of the "Jumbo" Ingenieur SL models produced by [[IWC]]. It was available from [[1980]] until [[1985]].

===== Overview =====
Both [[Rolex]] and IWC saw the need for a [[engineer|watch for engineers and scientists]] in the 1950s, combining rugged [[automatic]] movements, [[water-resistant]] cases, and [[anti-magnetic]] concepts in the [[Rolex Milgauss]] and this IWC Ingenieur. The concept has remained for over 50 years, with the [[IWC Ingenieur|IWC Ingenieur family]] spawning many models, including an iconic redesign by famed designer [[Genta, Gerald|Gerald Genta]], a pivot to [[motor racing]], and the use of exotic materials like [[titanium]] and [[ceramic]].

The Ingenieur had become somewhat stale by the mid 1970s but famed designer [[Genta, Gerald|Gerald Genta]] had shown a stylistic path forward with his groundbreaking [[Audemars Piguet Royal Oak]] in [[1972]]. Genta designed three "SL" or "Steel Line" watches for IWC, of which only the Ingenieur was presented for sale. The production "Ingenieur SL", introduced in [[1976]]. Like the Royal Oak, [[Patek Philippe Nautilus]], and [[Vacheron Constantin 222]], the new Ingenieur SL had a "sandwich" case, with both the caseback and bezel being removable. But unlike those others, the Ingenieur used a novel approach The Bezel and crystal were screwed in place like a screwed caseback using five "bores" spaced around the circular bezel. This resembles the Royal Oak's screws but is significantly different technically.

The new case was much larger than previous watches, with an integrated bracelet and [[tonneau]] shape. Measuring 40 mm by 38 mm around a 30 mm dial, the "Jumbo" nickname seemed appropriate for the time. Although the original [[IWC Ingenieur SL 1832|Ingenieur SL Automatic and Quartz models]] were quite thick, a new generation of [[quartz]] movements allowed IWC to dramatically slim down the watch for this **Ref. 3303**. This Ingenieur was just 8.7 mm thick, compared to the 12.5 mm of the original model.

The rest of the design remained the same, with [[lume]]d [[sword hand]]s, simple [[bar]] markers on the hours and tiny bars on the minutes, and a checkerboard [[guilloché]] pattern said to resemble graph paper. All models feature a [[date window]] at 3 00 and the "INGENIEUR SL" logo above 6 00.

The thinner Jumbo Ingenieur was available with a steel or [[gold filled]] case as Ref. 3303. A 18 karat [[yellow gold]] model was Ref. 9701 while a bezel with 35 diamonds in 18 karat gold was Ref. 9720. All models came with a matching bracelet. The steel models were water resistant to 12 ATM while the gold models were only good to 6 ATM. Just 369 examples of this generation were produced from 1980 through [[1985]] 149 in steel, 160 in steel and gold, 56 in yellow gold (Ref. 9701), and 4 with diamonds (Ref. 9720).

The "Jumbo" Ingenieur was not truly replaced until the [[2005]] introduction of the 42.5 mm [[IWC Ingenieur Automatic 3227|Ref. 3227]]. After this model and the original were exhausted, buyers were directed to the 34 mm [[IWC Ingenieur 3305|"Skinny" Ref. 3305 Ingenieur SL Quartz]] or [[IWC Ingenieur 3505|"Skinny" Ref. 3505 Ingenieur SL Automatic]].

===== External Links =====
  * [[http://www.moeb.ch/Ingenieur/03e_Jumbo.html|1976-1984: The «Jumbo» Ingenieur SL]]


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**Reference:**
  * 3303 [[Quartz]], [[stainless steel]] or [[gold filled]] with matching bracelet (309produced)
  * 9701 [[Quartz]], [[yellow gold]] with gold bracelet (56 produced)
  * 9720 [[Quartz]], [[yellow gold]] and [[diamond]]s with gold bracelet (4 produced)

**Movement:**
  * [[Quartz]] [[IWC 2250|Cal. 2250]]

**Case: **
  * [[Stainless steel]] or [[yellow gold]]
  * Ø 40.0 mm, H 8.7 mm
  * Soft-iron inner case for [[magnetic field protection]] up to 40,000 A/m
  * [[Sapphire crystal]]
  * Screw-in bezel and caseback
  * [[Waterproof]] to 6 or 12 ATM

**Dial:**
  * Black, rhodium, gold, or white enamel dial
  * Bar markers

**Functions:**
  * Hours, minutes, [[central seconds]] 
  * [[Date window]] at 3 00

**Bracelet: **
  * Metal bracelet system with deployant clasp

**Production: **
  * Produced [[1980]]-[[1985]]
  * Predecessor [[IWC Ingenieur SL 1832|Ref. 1832/3003 Ingenieur SL]]
  * Successor [[IWC Ingenieur 3305|"Skinny" Ref. 3305 Ingenieur SL Quartz]] or [[IWC Ingenieur 3505|"Skinny" Ref. 3505 Ingenieur SL Automatic]]
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{{tag>Watch_models Quartz_watches IWC_Ingenieur_models}}