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It is great fun looking for printing flaws or flyspecking.
Thanks for your comments, KG5. Yes, these KGV sidefaces are a lot of fun. So, yes, it's very happy stamping!
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So a "Tin Shed" printing flaw is a term used for all printing flaws that were not constant printing flaws
Well, if the stamps in my picture are not a constant electro flaw, I don't know what is. The original of the group photo were scanned at 1200dpi. I always scan at this resolution (the highest on my Epson Perfection V550) just in case I want to look at something in greater detail later. With this resolution, I can blow the picture up so that the bottom of the stamp is displayed across the width of my monitor without significant loss of quality. Measuring up from the bottom of the frame, the top of the fault was was at 20mm in all cases. And these stamps had postmarks ranging over about 9 months.
I can't take any credit for finding all these. They were in a packet from my father which I haven't looked at in 50 years or more. I have to wonder how he spotted them all - his eyes must have been pretty sharp at the time.