Scott 832A Mini Panes - Different Perforations.

Hi guys..Was going through my 4 philatelic mini sheets and Unitrade shows the perforation for these sheets as 13.3...I check them and came up with 13.4 which is more accurate.

Also checked a mint and used stock blocks, same perforation 13.4



Here is the reading for 13.3 as per Unitrade.


Here is the actual perforation, 13.4

I noticed in your 13.3 measurement, your left vertical baseline is slightly angled relative to the vertical perforations. While the angle isn't much, when you start talking about the different between 13.3 and 13.4, I can't help but wonder how much of an affect it might have. Likewise, even your 13.4 measurement is slightly angled, although not as much. Maybe consider redoing the measurement, making sure your left baseline is perfectly aligned with the vertical perforations?

Canada Post used to state perforation 13+ in their brochures for such stamps. Here is an interesting article on pages
57 and 58 on perforations. See http://www.bnaps.org/hhl/TopicsDisp...p?issue=1842

Jogil, your link is not working.


Peter

You need to be log as a member

Try http://www.bnaps.org/hhl/TopicsDisp...p?issue=1842

That is one heck of a journal Jogil. Thank you!


Peter

Peter: Thanks. It was written over 20 years ago. I wish that CAPEX was back.

The actual measurement is 13.333333...

There are 24 perf holes across the stamp width of 36mm.

so: 24 / 36 x 20 = 13.3333

A little searching in the introduction of the Unitrade catalogue says that "Perforation measurement, as listed in this catalogue, has been rounded to the nearest tenth for all non-line perforated stamps."

So, the 13.3 listed in the Unitrade is 13.33333 rounded to the nearest tenth. It appears the catalogue is correct.

Good answer stampquestion! Doing the math for perforations works best.

1.5 mm between holes and 20 mm is the standard philatelic gauge distance

20 / 1.5 = 13.3333333 (13 1/3) perforations per 20 mm (2 cm)