The AHO 1166 watch movement features a Girocap combined settings for escapement wheel and an indirectly driven minute system that enables a very large balance. This movement is a collaborative effort of renowned watch brands including Doxa, Ebel, Eberhard, Favre-Leuba, Girard-Perregaux, Juvenia, and Zodiac. The calibres Felsa 4035 and 4036 are mentioned as potential equivalents in the Bestfit register, although their actual manufacturer remains uncertain. This manual wind movement was primarily used around 1965.