Canada 1937 Mufti Coil Stamps Scott 238, 239, 240

So far the largest multiple of the new different perforations that have been found are strips of only four stamps.
Large multiples of the regular perforations have been found in large strips of many stamps such as 10, 20, 30, etc.

That is very different Jogil..Is their any explanation why the difference between and larger number of strips..???

Robert

wert: It could have to do with the different perforators used. The regular perforations were perforated by a web-fed bar perforator which can continuously perforate long rolls of printed stamp paper in one direction. The irregular perforations were perforated by a sheet-fed wheel perforator which can only perforate one stamp sheet at a time. Some web printed stamps had to be broken down into some sheets in order to get the irregular perforations.

Excellent discussion on this complex topic. To help understand better, I found this reference of line perforation of canada very useful:https://stampsmarter.org/learning/M..._canada.html

Similarly, U.S. coil stamps Scott 443 and 452 are compared below.


U.S. Scott 443 coil stamps (Wheel perforation 10-9.95 irregular across)


U.S. Scott 452 coil stamps (Bar perforation 10-9.85 regular across)

239 bar perforated 7.85 regular across / 240 wheel perforated 7.95 irregular across

Jogil..Strange perf alignment on my Scott 166 and 169...???

Robert

Also Scott 191 perf differences...

Robert

wert: These are all sheet stamps and not coil stamps. For 166 and 169, the horizontal perforations usually line up together but the vertical perforations usually do not. Why? They were perforated with a web-fed bar (11.25 horizontal) and wheel (10.94 vertical) perforator.

As a follow-up to this, I am led to believe that this variety may be from coil waste. Some sheets may have been cut out from the web-fed rotary press printed paper web roll and perforated by a sheet-fed rotary wheel perforator. The regular coils were web-fed rotary press printed in web rolls and they were perforated by a web-fed rotary bar perforator.

240 regular and 240 variety

Jogil. Just woke up today and saw this discussion. Here is a strip of 3 of Scott 240 with a similar shifted hole pattern.



My strips of 239 and 238 are all normal.

Partime: It is great that you found a strip of this variety in your collection. There are still some pairs and singles online for sale from some stamp dealers who do not know about this variety. The best time to get a variety is before it goes mainstream.

Interesting discussion I someone missed until I saw the reference in the Walsh BNA catalogue. This one in my collection looks to me like an example of uneven perforation.



~Greg

gmot: Yes, the stamp you show is an example of this perforation variety. I can still see some of these stamps available online for those who can spot these perforations.