====== IWC Ingenieur 3305 ====== *See Also [[IWC Ingenieur]] {{wst>image_cr|IWC|Ingenieur SL|IWC Ingenieur SL}} The 34 mm **Ingenieur SL** (nicknamed "Skinny") was a smaller version of the [[IWC Ingenieur SL|Ingenieur SL]] produced by [[IWC]] with both [[quartz]] and [[automatic]] movements from [[1981]] until [[1989]]. ===== 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. Genta's Ingenieur SL 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. Poor sales spurred IWC to search for a smaller and thinner movement to allow the watch to be reduced in size starting with the thinner [[IWC Ingenieur 3303|Ref. 3303]] but culminating with this **Ref. 3305**. ===== "Skinny" Ingenieur SL Quartz ===== Introduced in [[1981]], the "Skinny" Ingenieur SL was much more appropriate for the times. It used a [[quartz]] movement, the [[ETA]]-derived [[IWC 2250|Cal. 2250]], in a 34 mm diameter, 8.8 mm thick case. Although it strongly resembled the original Ingenieur SL, these tighter dimensions give the dial a more crowded look. The rest of the design remained the same, with [[lume]]d [[sword hand]]s, simple [[bar]] markers on the hours. Most models lack the checkerboard [[guilloché]] dial of the original, and most feature a [[date window]] at 3 00 and the "INGENIEUR SL" logo above 6 00. The original quartz Ref. 3305 came in [[stainless steel]] or [[gold filled]] versions, with a solid 18 karat [[yellow gold]] Ref. 9730 offered as well. Other versions include the Ref. 3315, steel with a leather or textile strap, gold Ref. 9703, and diamond Ref. 9721 and 9724. ===== "Skinny" Ingenieur SL Automatic ===== IWC also procured a small automatic movement from [[ETA]], [[IWC 375|Cal. 375]] ([[ETA 2892]]), which they used to create a smaller **Ingenieur SL Automatic**, Ref. 3505. It shared the same "Skinny" case as the Ref. 3305 Quartz model, including the soft strap version, Ref. 3515, and the a solid gold Ref. 9225. A pair of special diamond pave models, Ref. 0914, were produced for the Sultanate of Muscat and Oman. These original "Skinny" Ingenieur SL Automatic references were introduced in [[1983]] and offered through [[1985]]. ETA introduced the smaller [[ETA 2892-2|2892-2]] shortly after this watch was released, and this was adopted by IWC starting in [[1985]] as their [[IWC 37531|Cal. 3752 or 37531]]. Watches with this movement are quite similar to their predecessor, with the same case and materials, but have new reference numbers. The steel/bracelet model became Ref. 3506, while the steel/strap offering was 3516. The gold models were Ref. 9230 and 9236, with the diamond bezel offering becoming Ref. 9231. Most of these continued to be offered through [[1989]]. ===== 1980s Ingenieur Range ===== The old [[IWC Ingenieur SL 1832|"Jumbo" Ref. 1832]] remained on offer through about [[1985]] alongside the slimmer [[IWC Ingenieur SL 3303|"Jumbo" quartz Ref. 3303]]. But most buyers were more interested in this "Skinny" 34 mm Ref. 3305/3505/3506 offering through the end of the decade. Another option was the tiny "Lady" Ingenieur in 26 mm [[IWC Ingenieur SL Quartz 4501|Ref. 4501]] or 30 mm [[IWC Ingenieur SL Quartz 4503|Ref. 4503]] quartz or 30 mm [[IWC Ingenieur SL Quartz 4413|Ref. 4413 automatic]]. In [[1985]], IWC introduced one of the first [[titanium]] watches, the 32 mm quartz [[IWC Ingenieur 3350|Ref. 3350 "Ingenieur in Titanium"]] for men and 25 mm quartz [[IWC Ingenieur 4550|Ref. 4550 "Ingenieur in Titanium"]] for ladies. These models were offered in yellow gold and "mixte", and were also available through [[1989]]. The company also produced a [[perpetual calendar]] model, the [[IWC Ingenieur SL Perpetual Calendar 9240|Ref. 9240]] and [[IWC Ingenieur SL Perpetual Calendar 3540|Ref. 3540]] and introduced the first Ingenieur chronograph, [[IWC Ingenieur Chronograph 3733|Ref. 3733]]. The "Skinny" 34 mm Ingenieur SL offerings were replaced by the automatic [[IWC Ingenieur 3508|Ref. 3508 "500,000 A/m" Ingenieur]] in [[1989]]. The chronograph was replaced by the larger [[IWC Ingenieur Chronograph 3805|Ref. 3805]], and the other models were retired. ===== External Links ===== * [[http://www.moeb.ch/Ingenieur/05e_Skinny.html|1981-1989: The «Skinny» Ingenieur SL]] **Reference:** * 3305 (1981-1987) [[Quartz]], [[stainless steel]] or [[gold filled]] with matching bracelet * 3315 (1983-1987) [[Quartz]], [[stainless steel]] or [[gold filled]] with leather strap * 9703 (1982-1984) [[Quartz]], [[yellow gold]] with gold bracelet * 9721 (1981-1987) [[Quartz]], [[yellow gold]] and [[diamond]]s with gold bracelet * 9724 (1982-1985) [[Quartz]], [[yellow gold]] and [[diamond]]s with gold bracelet * 9730 (1981-1985) [[Quartz]], [[yellow gold]] with gold bracelet * 3505 (1983-1985) [[Automatic]], [[stainless steel]] or [[gold filled]] with matching bracelet * 3515 (1983-1985) [[Automatic]], [[stainless steel]] or [[gold filled]] with leather strap * 9225 (1983-1984) [[Automatic]], [[yellow gold]] with gold bracelet * 0914 (1983) [[Automatic]], [[yellow gold]] and diamond pave with gold bracelet * 3506 (1985-1989) [[Automatic]], [[stainless steel]] or [[gold filled]] with matching bracelet * 3516 (1985-1989) [[Automatic]], [[stainless steel]] or [[gold filled]] with leather strap * 9230 (1985-1986) [[Automatic]], [[yellow gold]] with gold bracelet * 9231 (1985) [[Automatic]], [[yellow gold]] and diamond bezel with gold bracelet * 9236 (1987-1989) [[Automatic]], [[yellow gold]] with gold bracelet **Movement:** * [[Quartz]] [[IWC 2250|Cal. 2250]] or [[automatic]] [[IWC 375|Cal. 375]] ([[ETA 2892]]) or [[IWC 3752|Cal. 3752/37531]] ([[ETA 2892-2]]) **Case: ** * [[Stainless steel]] or [[yellow gold]] * Ø 34.0 mm, H 8.8 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 or leather strap **Production: ** * Produced [[1981]]-[[1989]] * Predecessor [[IWC Ingenieur SL 1832|Ref. 1832/3003 "Jumbo" Ingenieur SL]] or [[IWC Ingenieur SL 3303|Ref. 3303 "Jumbo" Ingenieur SL Quartz]] * Successor [[IWC Ingenieur 3508|Ref. 3508 "500,000 A/m" Ingenieur]] {{tag>Watch_models IWC_Ingenieur_models}}