Type B (Baumuster B) is the B-Uhr dial layout that appeared in January 1941 and stayed in service to the end of the Second World War. The name comes from Beobachtungsuhr, the observer's watch, and these were precision navigation instruments issued to Luftwaffe flight crews. Unlike the Type A, the dial splits into two registers: large minute numerals running from 5 to 55 around the outer edge, and a smaller inner ring carrying the hour numerals near the center. A short hour hand reads the inner scale while a long minute hand sweeps the outer one. The logic is clever rather than fussy: in navigation the minute is what matters, so the minutes get the prime, most legible real estate and the chance of misreading the hour drops.
The originals came from five makers: A. Lange & Sohne, Laco, Stowa and Wempe in Germany, plus IWC in Switzerland. They wore roughly 55mm steel cases, an oversized onion crown you could wind with gloves, and long riveted straps to fit over a flight jacket, with FL 23883 stamped on the back. Today Stowa keeps the layout most faithfully: the Flieger Verus 40 Baumuster B runs about EUR 950 in automatic basic, EUR 1,080 in automatic top and EUR 1,100 hand-wound, while the Klassik 40 sits near EUR 800. Laco's Aachen 42 Type B (ref 861690) starts around EUR 399 on a Miyota movement, and its Original B-Uhr line runs roughly EUR 1,000 to 2,000. Archimede's 42mm B-Type, with an in-house Ickler case and ETA 2824-2, lands around EUR 950 to 1,000. IWC's Big Pilot is the direct descendant of the 1940 B-Uhr; the Big Pilot's Watch 43 (IW329303) retails around $9,700 in the US.
The first thing to check on a Type B is the dial hierarchy: are the outer minute numerals genuinely big and crisp, and does the inner hour ring stay readable. Some modern takes shrink the inner ring too far and the legibility suffers. Size is the second issue: the originals were 55mm, which is not realistic for most wrists, so Stowa's 40mm reading is the sane modern balance. Type B suits anyone who loves the tool-instrument look and the minute-first logic; if you want a clean 12 and conventional reading, the Type A is your dial instead. A Sellita or ETA-based movement is the safe, service-friendly choice, while Miyota entry models are affordable but light on resale.
One nuance worth knowing: Type B looks most correct as a no-date, three-hand design, because a date window breaks the symmetry of that outer minute ring. Plenty of purists insist on the no-date version for exactly that reason. And bear in mind the genuine wartime B-Uhren are serious collector pieces that reach five figures at auction, so for something you actually wear every day, a modern reinterpretation makes far more sense.