You're right on Jack, the dates on the parts list are 1970's.
On the Graco website, the previous and next versions of these can be found, just not these. The part numbers show up on replacement part lists.
What is the coating on the boxes? it appears to be porcelain, ceramic or powder coat. They also have little barrels inside to hold the oil and sit on bases with wheels. These seem to be NOS, unused. I would guess that these things would soon be coated in oil not long after entering service.
thanks for the reply.