The Ricoh CLDD watch movement, along with its variants, such as Aurore-Villeret 120, Bulova 6AH, FHF 120, etc., are considered equivalent in terms of interchangeability, although conflicting data exists in various movement registers. The Bulova calibres exhibit design details not found in the FHF calibres, suggesting a possible origin from Aurore-Villeret. Not much is known about the differences between calibres 120 through 122, 122N, 124, 125, 127, 1220, and 1221. The Ricoh CLDD is a manual wind movement that was utilized in watches around 1943.