AHO stands for August Hohl, a watch movement manufacturer based in Pforzheim, Germany, active in the mid-20th century. The firm produced manually wound lever-escapement movements of notably good quality for the price point, and also marketed complete watches under the brand name Constanta. Pforzheim was Germany's principal watchmaking centre alongside Schwenningen and Glashütte, and AHO was among its more technically competent producers.

AHO produced movements in 10.5 and 11.5 ligne sizes as well as a ladies' caliber (6.75×8 lignes). The AHO 1057 (10½ lignes, early 1950s) was well regarded as a cost-effective competitor to mid-range Swiss movements of the same period. Badenia used AHO base movements for its automatic module experiments. AHO did not survive the quartz revolution of the 1970s.

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Manufacturer Movement
AHO Automatic 25.9 mm
AHO Automatic 27.07 mm
AHO Automatic 27.07 mm
AHO Manual 23.69 mm
AHO Manual 23.69 mm
AHO Manual 23.7 mm
AHO Manual 26 mm
AHO Manual 26 mm
AHO Automatic 25.94 mm
AHO Manual 26 mm
AHO Automatic 27.07 mm
AHO Manual 23.69 mm
AHO Manual 23.69 mm
AHO Manual 26 mm
AHO Manual 26 mm
AHO Automatic 25.94 mm
AHO Automatic 25.94 mm
AHO Manual 26 mm