We still have a station locally, in Mosherville, MI, that uses similar stainless steel pumps from the late 60's, early 70's. I imagine as long as they pass inspection of weights and measures and are certified, the age of the unit doesn't particularly matter. We know many farmers are still using 50 or 60 year old pumps on the farm. Obviously correct measure doesn't matter to them, but it goes to show the pumps can work for many many years!
Darin

Darin Sheffer
Always looking for Mobil and Marathon items I don't already have!