Introduced in the early 1950s, Patek Philippe's reference 2568 was in production for a decade and released in different variations: Ref. 2568 with hooded lugs and subsidiary seconds, Ref. 2568-1 with flat faceted lugs and subsidiary seconds, Ref. 2568-3 with hooded lugs without subsidiary seconds, and Ref. 2568-4 with flat faceted lugs without subsidiary seconds.