Newfoundland 245 And 254

1. Certainly, if there is not a dent (part perf hole) in each of the 4 corners, then it is NOT a comb, or Harrow puncture.

2. Interesting question, I very much doubt it, I cannot see differing perf puncture
guaging meeting at the corners.
Certainly never come across it in my experience.

This punch and die pair, (Grover Perforator) should ideally indicate how the
COMB perforator punctures remain constant through the perforation process.

With each press of the punch, the bed of the perforator advances 2 stamp distances.
And how the name "Comb" was arrived at.

The distance between the two punch plates, leaves imperforate paper, between the two panes of the stamp sheet.

I see your point, and the pointlessness of my question: Even if by coincidence, the different perf will combine with the stamp size to make overlapping holes at the corners, the holes will be of different sizes (smaller perf number - bigger holes, right?) and there will be some distortion. Even if it will look comb perf it will actually be a pseudo comb perf.

Hypothetically No.

A comb perf, by definition has puncturing pins, FIXED in both the vertical and horizontal planes.
No matter how you designed the puncturing pins, in this format
it would remain a Comb. (or, in multiples forming a block , a Harrow)

Some souvenir sheets (Russia?) show a stamp with part perf and part imperf.
This is then just a punch and die pair specialty.

Line perf has only one row of puncturing pins.

The stamp sheet has to be rotated, to effect all round separation holes.

Here is a "measured" copy of the stamp image JOGIL has uploaded. I am assuming this is a photo of the stamps and not a "scan" of the stamps. The measurements are off. But you can see that the image size are different in the two 2C green stamps
(with a high quality scanned stamp you would be able to accurately measure the stamps sizes)



Trodent

Here are some of the other Waterlow printed stamps in this issue side by side together with each other for comparison.