When was the LAST steel 72 made?

[Tinkerer]

I’ve personally seen 3AA 2250 steel 72s with initial hydro dates ranging from the early 60s through the mid 70s. I have heard of stamps from the early 50s.

What I have not seen or heard of is a stamp as late as the 80s. When was the LAST steel 72 stamped, and what is the latest date you have personally seen?

 

[yn37605]

I have one with 79.

 

[John C. Ratliff]

I had a steel 80 cubic foot, stamped for 2475 psig fill, in the late 1970s. It was a lengthened steel 72. ‘Don’t know the latest date for a steel 72 though.