The pictured 1928 2c KGV Scroll green coil has a small piece of selvedge gummed to the the back side, with the same perf 8 as the coil stamp. Given the lack of perfs on the stamp on the left side, thinking it is the start of the strip, but not clear to me how the selvedge got attached. The gum is undisturbed.
Hoping someone more familiar with the coil printing process of the day can comment on how this may have been produced.


Thanks! Greg