Quote:
The worst period in US stamp production for perf-pins was during WWII when many constant missing pin patterns up to and including imperf between stamps are found. The Defense issue (899-901) and lower denomination Prexies (1938 Presidential Issues) were especially hard hit.
One could do well putting together a subject area collection of the period.
Parcelpostguy,
Exactly. I think there's a good article somewhere in there too. Especially the point about WWII. The shortage of various items, such as metal at that time resulted in drives. The metal was needed to make war materiel. That might have prompted the same efforts in stamp printing; pins break, but "make it do," and "make it last" could mean waiting longer than usual to make repairs, even to metal pins.