I have a Stowa Classic 40 and a Laco Munster but have only tried the IWC Big Pilot and I think the comparison is pointless (though still interesting). IWC doesn't have quite the same history for me as they only built about 1200 Fliegers during the war whereas Lacher&Co built over 6500. The sapphire mounting and Faraday cage make the IWC more purposeful to today's pilots but I've read plenty of accounts that the accuracy is seldom as high as IWC claim. For some, size matters and both fall short of the original 55mm but the IWC definitely has a better vibe in that area. That aside I can't fault the wearing experience of the Laco and if I do buy an IWC I know I will still wear the Laco more - it's a watch to grow old with. IWC also built for the RAF which would be its chief relevance in my aviation watch collection but as a definitive Flieger the Laco wins hands down for me regardless of caliber or price. As a functional Pilot's watch the IWC wins easily but there are more pilot's watches to match the IWC than there are Fliegers to match the Laco.
IWC re-issued the watch with a Tourbillon under the turbine a couple of years ago but not as nice a dial. They're still around for about a hundred and ten thousand pounds!!!
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