The Canada Admiral Stamp Perforation Change Of 1912

Has anyone noticed two different types of perforations on their Canada Admiral stamps with older perforations being smaller and rougher looking and newer perforations being larger and cleaner cut?

Marler noticed that the newer perforations started appearing first around November 1912.

This is more noticeable when they are both on a stamp block such as horizontal smaller perforations and vertical bigger perforations shown in the picture of the stamps below. Do you have any of them?

Hi Jogil. This has been on another thread here and there is lots of info about it. Maybe a search will help?
Need to change this. The perf change I was referring to is more recent! Sorry!

Peter

Hi Petert4522. There was also another perforation change by CBN in 1962 which was 50 years later.

Yup, that's what confused me, Jogil! And I do not know a thing about the earlier one!

Peter

Jogil
could it has been caused because of the switch from wet to dry printing?(in 1922?)

Gilles le timbre: No, because it occurs earlier and it occurs on stamps that are only wet printed such as Scott 104. However, it would appear that by the time of 1922 when dry printing started to appear first, the larger perforations are found on them. Here's another block with both perforation hole sizes (small horizontally by big vertically):