The Aberdeen piece is one of several still surviving, but has an interesting
history. Dravo made TWO T71 cannon SN #1 barrels and one of them was used for
the famous 15 kt nuke shot in 1953. The problem was that the barrels may have
been mixed up during depot overhaul and to this day both APG and Fort Sill
(who has the other #1) argue about which "Atomic Annie" fired the nuke round!