Overall length including swiveling lugs is 50 mm. Lugs are 16 mm.This is one I can honestly say I have never seen before. The two ads shown date 1940 (left) and 1939 (right). Ads state 17 jewel and this one is a 21 jewel; but case and face are a match the ad. Movement is a match to the case s/n date suggesting it is likely the original.
Case back marked with s/n and "B-10K Gold Filled"
The 1939 ad was uploaded to partial ads on 12/26/12 (Bobbee) and the 1940 ad was just found by Kathy on the internet.
I have not been able to locate another like it anywhere on the internet either as an ad or watch example. It is so unlike any other Conqueror, at first I thought the ad on site might be a mis-print. Then Kathy emailed me another that differs in age by a year , suggesting ad is indeed correct.
Runs quite fast, hopefully a service will fix that issue.