O.H.M.S. broken perfins

The O.H.M.S.(On Her Majesty's Service) perfin process was used by United Kingdom, Canada, Australia, etc. that have the same Monarch.

TYPE I - FOUR-HOLE OHMS

First issue 1938

last issue 1949

TYPE II - FOUR-HOLE OHMS

First issue 1942
last issue 1951

There were so many produced that the perforation machine took a beating.

Below is an example of a strip of Scott 0270 stamps with progressive pin breaks.

Robert