The engraved Kookaburra 3d and 6d stamps were both issued only single line perforated.
That means, they were perf one row at a time up, and then down each sheet, in a pile of 100 master sheets or so.
Just like using a slightly higher tech sewing machine basically. And often not very well done.
The 3d Blue Kooka mini sheets can often have 1 or 2 stamps nicely centred, and the other 2, with perfs touching or cut into. Either vertically or horizontally - or both!
To find one of these sheets looking even HALF decent facially is darn hard. (And the reverses are often appalling, as these were essentially printed on coarse blotting paper, and thin, and fox readily, but that's another story!
Near all corners are "funny" looking on line perfs, as can be seen, as they do not intersect neatly as we find with the far more usual comb perforation.
The M/S above I sold this week here to a member for my usual retail, and thought nothing about it, even though the stamps were nicely centred and "larger" then usual -
If we tore stamp 4 out on its own, it would look like this - i.e. "larger" than usual.
We do not live in ebay world where fantasy, lies, and total guesswork and clueless Bunnies rule the world - we live in the REAL stamp world!
Let's see how you go.
Make your vote, and then add your comments as to WHY.
stampboards above all else is about LEARNING.
This question does have a definitive answer, and that answer will be posted after we get a few dozen votes in.