As I understand lot codes, the keg pictured was made on May 10, 1973. One source I've seen would say it was made by B shift on that day but other sources have been silent on the end letter.
I would use it with PB data without much concern, but then I would probably use it for lighter loads in both shot and powder charges.
Or, you could offer it for sale. It's a good bet that at least one of the three shooters still using PB when it was discontinued is still alive and would be willing to buy it for "big bucks". 😃 You could have a bidding war if two of them are still alive!
