Original Laco / Lacher & Co. Pforzheim watch case. The interior caseback retains its original wartime markings: Beobachtungsuhr Bauart: Durowe Gerät-Nr. 127-560B Werk-Nr. H2149 Anforderz. FL23883 Hersteller: Lacher & Co. Pforzheim Specifications: Diameter: approximately 55 mm Original Laco case components Snap-on caseback Crystal NOT included Movement NOT included Small dent present on the caseback Sold exactly as pictured The original Durowe D5 movement fits this case correctly (shown in the photographs for reference only and NOT included in the sale). Historical Notes: The markings correspond to those found on original Laco Beobachtungsuhr (B-Uhr) production from the Second World War. The designation FL23883 refers to the official Luftwaffe specification for observation watches, while Gerät-Nr. 127-560B is the military equipment reference used on Laco navigation watches. Original Laco B-Uhr watches were fitted with the Durowe D5 movement, a large pocket-watch-based calibre developed for precision navigation. These historical details are well documented in surviving examples and period references. This particular case differs from the commonly encountered wristwatch B-Uhr cases by lacking fixed strap lugs. Its exact original application cannot be confirmed. It may represent a special-purpose case, a workshop or service case, or another period configuration. As no period documentation confirming this specific case style has been identified, it is offered as an original Laco / Durowe case with authentic wartime markings, allowing collectors and researchers to draw their own conclusions. Please study all photographs carefully as they form an important part of the description.