Rob, thanks for posting a photo of your washer motor cover stamp, really helpful! I see the build date of your Z is within 2 weeks of mine (and both Norwood). I don't know if the washers were built in batches (like alternators and distributors) however 24 69 is (now) a known date so I think I'm going to add the 24 to my cover stamp. Another detail from your cover stamp is the orientation of the stamp is the inverse of how I applied mine. That is to say, in your photo the raised boss is on the right side of the photo with the date reading right side up. Mine is upside down to yours...that's because "69" reads the same upside down! Here is my original (partial) washer cover stamp turned the same orientation as yours (plastic boss on the right). The stamps are the same and the partial yellow ink mark to the left of the 69 on my cover likely would have been the 2nd number of the Julian date. When viewed in the engine compartment the date will read upside down. This is great info, thanks again for posting.