The perforating machines were not always made up of equally spaced pins.
Thank you John,
that is a first for me, so 1 machine, had differing perf spaces, in the space occupied by the first, and last 3 rows of a sheet.
Surely that would also move depending where you placed the sheet
underneath the pin die.
Come to think of it, I have never seen a picture of Australian Line perforating machine.
Perhaps "either top or bottom" may have occurred depending on the
way the sheet was orientated prior to perforating, meaning only approx 3 rows were unevenly spaced.
As a machinist, I can understand how difficult it would have been to
space and insert tiny pins (accuratel;y) into a die around that time.
Australia: List of Post and Telegraph Offices 1961
SOLD $24 Opened at $9