Rare Union Horlogere System Glashütte installation from the early 1900s. Very nice porcelain dial, very nice case. Comes with a nice leather strap, the strap is good for wrists up to 19 cm. Hand adjustment with a shift lever. At 4 o'clock, the small switch must be switched, then the hands can be adjusted with the crown. If you switch it back, you can wind the watch with the crown. System Glashütte movement. Works. Size: 48.5mm, measured without crown.