Up for sale from my personal collection is a truly excellent condition IWC Ingenieur no-date 666, the original reference of the Ingenieur. The no-date variant is much more rare than the more commonly seen date versions. The watch hovers between dressy and tool (love that it was on the early anti-magnetic watches), with a heft that makes it wear bigger than it measures.

Case: stainless steel, 36.5mm, 18mm lugs. looks unpolished to my eye as original finishes are all there and the lugs are razor sharp. serial is strong between the lugs. antimagnetic cover is present.
Movement: 21-jeweled caliber 853 created by IWC's technical director at the time, Albert Pellaton
Dial: original and aged to a beautiful eggshell color
Crown: original IWC fish crown (was replaced during service)

The watch was serviced by Mitka here in the UK in 2020. Movement photos are from when it was in his workshop.

Watch comes head only. Pictures form part of the description.

Asking £4000 GBP or equivalent in USD net to me with Royal Mail special delivery included in the UK. International shipping available at cost. Bank transfer / transferwise / revolut preferred. Watch and myself are located in London. References available here, IG, & ebay.

No returns unless the watch is grossly misrepresented. Please PM with any questions. Thanks for looking and thanks to OF for the space!