AGE OF PERFECTION!
Take a look on the crossmember in the front that holds the water valve and such.. on the left side, there should be a little sticker which will have a date code on it..Simple code... calendar day of the year and then the year should be total of 5 digits max. That is the birthdate of the machine. They even used to use that on the mixers in the late 70's and early 80's
Hope you find it.