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This pattern is a rather recent discovery. The location of the #4 pin confirms it as from the David Williams machine. Both this pattern and 2-5-7-8-9 were thought to be broken pin patterns of their original pattern 2-5.
A stamp on piece was found showing a blind perf in the 7 position dated 4/6/1910. From approximately this time on the Schermack mailing machine was sometimes punching the 7 position, some times leaving blind perfs in 7,8 or 9. Assuming a loose die was calusing problems punching the bottom row. The question is what do you call them?
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