They are not dated for date of manufacture, but they are not in KF boxes. We have used them in two successful rebuilds here, one is a model K53 and one is in model K54. We also have some other parts for the 53/54 hydramatics. Note - the rear band on our K54 was different from the 52/53 rear bands we have in stock. It had to be sent out to be relined. Chris Luecnt (moderator) might have some of the 54's in stock as Walkers KF parts had a lot of transmission parts. Bob and Char Dayton, Vermont.