The Citizen 0140 watch movement is a manually wound movement with a Breguet hairspring and adjustment screws on the balance spokes. It is manually engraved, damaskeened, and gold plated by Zwyro, which was owned by Mr. Zwyssig, a former technical director from IWC. The watches were produced in 1969 with the Ref. 810, but sold in 1975. They are recorded at IWC with the correct case- and movement numbers, but with the "wrong" Ref. 2600. The movement also features a sweep second hand.