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OSNI One Inch
The front cover of the OSNI One Inch Series in the 1970's.
OSNI One Inch revision code from a Third Series example. This code should not be used for dating purposes
Guide to the location and style of printing dates on OSNI One Inch sheets, 1958 in this example.
Guide to the location and style of printing dates on OSNI One Inch Third Series sheets, 1971 in this example.
