Beobachtungsuhr - a brief explanation
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  1. #1
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    Beobachtungsuhr - a brief explanation

    The German term „Beobachtungsuhr“ goes back to pilot´s watches of WW II. Strictly translated it has to be an „Observer´s watch“ or „Observation watch“ but on most watch related fora you`ll read „navigator´s watch“, „pilot´s watch“, „B-watch“ or even „Flieger“, which is the expression I like most.

    These B-watches have been made for the German Luftwaffe by only 5 manufacturers

    A. Lange & Söhne
    Laco (Lacher & Co)
    Stowa (Walter Storz)
    Wempe (Chronometerwerke Hamburg)
    IWC

    and contained high quality pocket watch movements:

    Lange & Söhne: cal. 48/1
    (due to limited capacities watches have been assembled by Huber/Munich, Felsing/Berlin, Schieron/Stuttgart, Schätzle & Tschudin/Pforzheim, Wempe/Hamburg).
    Laco: Durowe cal. D 5
    Stowa: Unitas cal. 2812
    Wempe: Thommen cal. 31
    IWC: cal. 52 SC (SC= „seconde central“)

    The specifications of these watches had been defined by the „Reichsluftfahrtministerium“ (RLM) – Imperial Air Ministry (see attached file)



    Due to those specifications all B-watches had the following features in common:

    - A case diameter of 55 mm
    - Marked on the back with FL 23883 (FL = flight, 23 = navigation)
    - Equipped with large crowns in order to be used with gloves
    - Hacking movement (the second hand stops when pulling out the crown / essential for a precise time setting)
    - Breguet balance spring
    - Regulated and tested as chronometers
    - Long leather strap (to be worn on the sleeve of a flight jacket).

    There have been two different types of dials (Pls. note: there are other figures available on the net. not sure whioch are correct)

    Type A (Baumuster A) from 1940 to January 1941
    a classic dial with numerals 1 to 11 and the triangle with two dots at 12

    Type B (Baumuster B) starting in January 1941
    Big minute numerals from 5 to 55 and a small inner circle with numerals for h, at the position of 60 min a triangle and a line on its top.


    If your are interested in watches of WW II and their history I recommend to visit the hompage of Konrad Knirim (Militruhren: Collectors Site for Military Timepieces) .


    The Stowa B-Uhr Baumuster B



    A. Lange & Söhne, Baumusuer B:



    Stowa, Baumuster A:



    IWC, Baumuster A:



    Laco Baumusuer B:



    More to read: https://forums.watchuseek.com/f7/b-uh...en-438490.html
    Last edited by stuffler,mike; July 14th, 2013 at 10:55.
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    Kind regards
    Mike


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  2. #2
    Moderator at Large stuffler,mike's Avatar
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    Re: Beobachtungsuhr - a brief explanation

    Another interesting info re FL 23883 taken from a former post

    FL 23883 is a specification of the Reichsluftfahrtministerium (RLM) for inventory purposes, FL 23 was used for navigation devices, see more here:

    Document: RLM FL 23883 (B-Uhr) drawing of December 1942 - WW II -B-watch draft by Wempe

    Here are some other inventory FL

    20274 Elt. Doppeldrehzahlanzeiger 2 x 500 – 3600 U/min

    20286 Elt. Ferndrehzahlanzeige 500 – 3600 U/min

    20342 Elt. Schmierstofftemperaturanzeige 0 – 130 ° C

    20343 Temperaturanzeige 0 – 160 ° C

    20349 Außenlufttemperaturanzeige -20 bis + 60° C (Siemens)

    20555 Ladedruckanzeige 0,6 – 1,8 ata

    20556 Dosenladedruckanzeiger 0,6 – 1,8 ata

    20569 Doppel-Drehzahl-Ladedruckmesser 0,6 – 1,8 ata

    /0 – 3600 u/min

    20572 Elt. Kraft-/Schmierstoffdruckanzeiger 0-3/0-10 kg/cm³

    20682 Vierfachanzeige 2 x 0-130° u. 0-1/0-10 kg/cm²

    20723 Elt. Kraftstoffvorratanzeige

    20743 Tankanzeige

    20841 Borduhr (cyx)

    21118 Zündschalter

    21119 Zündmagnetschalter 45/8Z (ssh)

    21214 Anlaßschalter

    22___ Flugüberwachungsgerät

    22230 Fahrtmesser 60-550 km/h (Bruhn-Werke)

    22234 Fahrtmesser 100 – 900 km/h

    22316-1 Feinhöhenmesser 0-1000 m

    22316-10 Grobhöhenmesser 0-10000 m

    22320 Fein- u. Grobhöhenmesser 0 – 10000 m

    22382 Variometer –15 bis + 15m/s

    22384 Variometer –15 bis + 15m/s

    22410-1 Wendehorizont

    22411 Wendehorizont

    22413 Notwendezeiger

    22414 Notwendezeiger

    22557 Notauslöseknopf LAK

    22559-1 Hauptschalter für Kurssteuerung Lschü 4

    22561 Kurskreisel Lku 4

    22562 Kurszeiger LKz 3

    22600 Borduhr Junghans

    22602 Borduhr Kienzle

    22810 Dreifachtrimmanzeige

    23___ Navigationsgeräte (navigation tools)

    23233 Nahkompaß FK 38 (nfe) (Askania)

    23234 Bordkompaß OK 38 (bxx)

    23235 Armkompaß AK 39

    23322 Höhenmesser

    23331 Mutterkompaß PFK/m (Eckhardt AG)

    23334 Führertochterkompaß PFk/f2

    23338 Führertochterkompaß PFk/f3 (Patin)

    23379 Peilumschalter PSH 15

    23474 Peiltochterkompaß KT/p2

    23501 Deviatstafelschieber mit Ablenkungstafel für Führer-

    tochterkompaß

    23825 Dreieckrechner DR 2 (C. Plath)

    23883 Armbanduhr B-Uhr

    23885 Borduhr Bo-UK 1

    23886 Borduhr Kienzle u. Junghans Bo-UK 2-1

    23888 Borduhr – Blindflug Schlenker–Grusen Bo-UK2-1

    23888 Borduhr – Blindflug Schlenker –Grusen Bo-UK 3

    23894 Astronomisches Rechengerät – Carl Zeiss (blc)

    23905 Ablenkungstafel 5 für Peiltochterkompaß

    23906 Ablenkungstafel K 6 für Nahkompaß

    25___ Nachrichtengeräte

    25591 Stationsuhr - Luftwaffe

    26749 Schwingungsanzeige Sch A 2

    26751-1 Schwingungsnazeige SAM

    30486 Sauerstoffanzeige

    30489 Sauerstoffwächter (Rüstsatz)

    30496 Sauerstoffdruckmesser (Rüstsatz)

    32112-4 Kommandoschalter

    32112-6 Kommandoschalter

    32116-1 Leitungsstecker 1-polig

    32331 2 Meßstellenumschalter

    32315-2 Netzausschalter

    32349-2 Kippwechselschalter

    32350 Kippschalter

    32401 Verdunkler

    32401-2 Verdunkler

    32402 Verdunkler

    32502-4 Stromspannungsmesser -30/+30 A/V

    32502-7 Amperemeter – (Siemens)

    32509-3 Amperemeter – (AEG)

    32510 Voltmeter (jjb)

    32525-3 Schauzeichen für Staurohrheizung

    32529-1 Merkleuchte rot

    32532 12 Lampengerät

    32601 Preßstoffsteckdose - Vierkantsteckgehäuse

    32616 Steckerplatte

    32636 Leitungsverschraubung

    32950 Durchführungsflansch

    32951-2 Leitungsstecker

    32953 Dichtring

    47915 Steuerknüppel KG 13 A (ngk)

    47919 Steuerknüppel KG 13 B

    50001 Selbstschalter 6A (Luftgerätewerk Hakenfelde)

    681801 Dreiachsentrimmschalter
    Last edited by stuffler,mike; January 3rd, 2013 at 16:33.
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    Kind regards
    Mike


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