Girard-Perregaux 1966 Ultra-Thin 41mm October 26, 2013 Watches If you are looking to add a classic dress watch to your collection, the Girard-Perregaux’s 1966 Ultra-thin 41mm should not be overlooked. It features a nice uncluttered dial, classic timeless kind of design, and Girard-Perregaux’s in-house caliber GP01800-0004. The 41mm case diameter might be a tad large for a classic dress watch, but it does show that the brand is keeping up with the times. Leave a Reply Cancel Reply Your email address will not be published.CommentName* Email* Website Are you a robot? * − seven = 1 Notify me of follow-up comments by email. Notify me of new posts by email.