Hi T-Rex Ted,
Good stuff
I also have noted that of these twelve 460-Only subjects, I've never found with a SC350-460 Factory 25 back. So it appears that for
all 460-Only subjects, the SC350-460 Factory 25 and SC350-460 Factory 42 backs are possibly mutually exclusive (meaning if you find one with a Factory 25 back, you won't find it with a Factory 42 back, and vice-versa.) You've probably mentioned this in some other thread and I missed it.
Also, I've had in my notes that I've seen a Devore with a P42 back. I'm not sure where or when and I can't find a scan at the moment, so I may be wrong. But I got to wondering if for some reason it might have got printed ahead of schedule in place of the 350-460 series subject Tinker Bat Off for some reason (maybe the plate for Tinker broke before or early in the P42 print run and maybe they had Devore ready to go so they used it? - I know it's a real stretch of imagination), which is the only 350-460 subject we haven't found with a P42 back that we believe should have been printed with a P42 back. Just a thought and I'll let you know if I'm able to verify the Devore P42.
Best Regards and Happy Collecting
Craig