Manufactured by "Winter Instruments" (Jungingen, Germany) 1970's. This Variometer (Vertical Speed Indicator) came from a Schleicher ASK-14 Motorglider in the 1990's. Manufacture Number: 33635 (German: Werk-No:) Seen listed for anywhere from US$327-$726. A rare find and nice piece for anyone restoring vintage planes/gliders from the 1960-80's. The instrument was in working order when taken from the plane in the 1990's. It has not been tested or overhauled.