IWC In-House vs. ETA Movement Accuracy Debate

But I do have these modern pilot's watches from IWC with Sellita-based no-date movements and they keep chronometer time. +1s to +2s per day. I also have a vintage Ingenieur ref. 666 from the late 1950s with the in-house cal. 853 which needs a service so I can't really qualify it as a bad timekeeper until it gets serviced. But vintage IWC in-house movements like the cal. 853 and cal. 89 are probably in a different league from these new movements. They were designed and built back when IWC was tru

I have two IWCs with in-house movements, 8-day manual wind and chronograph classic, both Portuguisers. Not sure how relevant these are to your experience, but both keep good time although they’re both tuned to run fast, ~+5 seconds per day. The chronograph does decay significantly near the end of its power reserve, but I don’t think that’s unusual, unless you’ve been spoiled by watches with Breguet overcoils. Also, in my experience with (3) 7750-based IWCs, although they can be tuned to run very

I have had a few big pilots including the new ones. A few yacht clubs. Both new spitfires. I think Richmond group ruined their brands by making them share generic “in house” Calibers. I’m happy with Valjoux 7750 in this one!

I have no cosc watches, and i am happy about theire acuracy.

My 70 year old Valj 22 is Much smoother. But i sure loved that blue dial !

You could push the crown in to set the time and the hands would t budge. Great for people like me who need their minute hands to align perfectly with markers when the seconds hand reaches 12 o’clock. The jump is still very small, but there’s a bit more give now.