I know someone who has a set of Byron Nelson Tourney irons (2 through 9 minus the 8) sitting in their garage. There are two grooves machined lengthwise across the backs of the blades upon which Rec No 185T is also printed.
I hadn’t taken the clubs off the rack in the garage the first time I saw them.
Upon taking them down, they do appear to show their age!
The set contains the 2-9 irons, without the 6 iron.
My apologies in advance lag!