IWC Ingenieur Jumbo SL, Ref 1832 circa 1983, NICE - Parthian Watch Company
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IWC IW3505-13 : Ingenieur SL Automatic Stainless Steel / Yellow Gold / Silver / Bracelet » WatchBase
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IWC Ingenieur SL white graph paper dial - Automatic Ref. 3505 - Gerald Genta - 1982 - Watchurbia
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IWC Ingenieur SL Automatic – Analog:Shift
HODINKEE reviews the vintage ref. 3521 Ingenieur SL from IWC
3505 IWC Ingenieur SL White 'Graph Paper' Dial | Hairspring
IWC | Ingenieur SL Automatic | ref. 3506 | FINETIMEPIECES.COM
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IWC Ingenieur SL white graph paper dial - Automatic Ref. 3505 - Gerald Genta - 1982 - Watchurbia
IWC | 'JUMBO' INGENIEUR SL, REF 1832 STAINLESS STEEL BRACELET WATCH WITH DATE CIRCA 1978 | Watches Weekly | London | 2020 | Sotheby's
HODINKEE reviews the vintage ref. 3521 Ingenieur SL from IWC
