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Perforation Hole Position Parallelism

 
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Pillar Of The Community
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Posted 06/03/2017   11:31 am  Show Profile Bookmark this topic Add jogil to your friends list Get a Link to this Message
There is something that has been disturbing me for some time about what appears to be so called matching parallelism between the perforation holes found on the opposite rows of vertical perforations and on the opposite rows of horizontal perforations. This is to be expected from stamps that have been perforated by rotating bars mostly and sometimes but rarely and coincidentally on stamps perforated by rotating wheels.


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perforation hole matching parallelism (perforating bars)


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perforation hole non-matching parallelism (perforating wheels)


Flat plate perforation 11 (Kiusalas 72 = 10.94) should tend to show non-matching parallelism because it was made by rotary perforating wheels. However, unless I am mistaken in most of my observations of U.S. Scott # 596 and # 613, they tend to show matching parallelism on their perforations which is not to be expected for such perforations made from perforating wheels. See

https://siegelauctions.com/display_...hp?catno=596
https://siegelauctions.com/display_...hp?catno=613
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Edited by jogil - 06/03/2017 12:00 pm

Pillar Of The Community
United States
2903 Posts
Posted 06/03/2017   3:53 pm  Show Profile Bookmark this reply Add hy-brasil to your friends list  Get a Link to this Reply
The perf pins are on a freewheeling rotating wheel. Perfs will mostly not line up but it can happen, it's not impossible. The #596 in color on the pages above was probably selected for "balance", with full corner perf teeth. The perfs may look matched by eyeball but put a square or architect's triangle on the image and there are tiny differences. Look at all the other photos on those pages; they don't match up from what I see. Look at the #613 pair; cover up the top horiz perf between the stamps and by eyeball, the top and bottom perfs look matched. Looking at the bottom center perfs only, someone could even think #613 was a comb perf stamp. Uncover that one horiz perf and I think you can see the difference.
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Edited by hy-brasil - 06/03/2017 3:58 pm
Valued Member
United States
205 Posts
Posted 06/10/2017   10:48 am  Show Profile Bookmark this reply Add Tipzi to your friends list  Get a Link to this Reply
I noticed this some time ago, and it was explained to me that the rotary stamp designs, being a bit taller in this case, required adjusting the perforating equipment to the required spacing. Typically, the machinist aligned the perforations each time he did an adjustment. The alignment didn't last very long, so only the stamps with short runs like the tall rotary sheet wastes and #461 typically display this alignment.
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Pillar Of The Community
3636 Posts
Posted 06/10/2017   2:13 pm  Show Profile Bookmark this reply Add jogil to your friends list  Get a Link to this Reply
Tipzi: Thanks. This makes sense especially if the known examples all come from the same pane such as only from one (or two) of the first perforated panes after the adjustment. Since there are more copies of U.S. Scott # 594, some show perforation hole matching parallelism and others show perforation hole non-matching parallelism depending on the horizontal or vertical sides. See: https://siegelauctions.com/display_...s.php?id=235
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Edited by jogil - 06/10/2017 2:15 pm
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