The reference 855 “Flying Saucer” was inspired by the work of Patek Philippe’s genius designer Gilbert Albert. The extra thin case with knife edge is reminiscent of the 1960s and early 1970s space race. The two-piece case by Eggly & Cie with knife edge accommodates the flat small caliber 175 giving the watch a feel of the fictional space ships seen in early television programming. In production from 1964 until 1971, the watch was made in yellow and white gold, along with platinum, and was sold like the present watch with a diamond-set or with a plain bezel. Additionally, there Patek Philippe produced a limited edition yellow gold example made and personalized for IOS (Investors Overseas Services, Ltd). The present watch, from 1966, remains in excellent overall condition and is a fine example of the innovative and creative design options released by Patek Philippe during the mid-20th century.