Notice Any Perforation Change Here?

Hi jogil,

here are the results of your scans

Sc# Top Bottom Left Right
389 12.03 11.94 11.93 11.87
390 11.95 11.92 11.85 11.85
391 11.94 11.89 11.93 11.92
392 11.9 11.89 11.88 11.96
393 11.9 11.9 11.88 11.88
394 11.99 11.98 11.95 11.88
395 11.9 11.9 11.89 11.89
396 11.88 11.88 11.85 11.85
397 11.89 11.89 11.85 11.85
398 11.88 11.88 11.9 11.9
399 11.9 11.89 11.89 11.89
400 11.92 11.89 11.85 11.89
401 11.8 11.8 11.8 11.8
402 11.8 11.8 11.8 11.8
403 11.85 11.8 11.8 11.8
404 11.8 11.8 11.8 11.8
405 11.85 11.8 11.8 11.8
410 11.84 11.84 11.84 11.84
412 11.84 11.84 11.85 11.85
413 11.83 11.83 11.8 11.8
414 11.84 11.8 11.8 11.8
415 11.8 11.8 11.83 11.83
416 11.84 11.84 11.85 11.8
417 11.83 11.83 11.8 11.8
418 11.8 11.8 11.8 11.8
419 11.83 11.83 11.8 11.8
430 11.8 11.8 11.8 11.8
431 11.83 11.8 11.85 11.85
432 11.83 11.83 11.8 11.8
433 11.85 11.85 11.83 11.83
434 11.8 11.8 11.86 11.86
435 11.8 11.8 11.8 11.8
436 11.84 11.84 11.8 11.8

regards
Marios

For Canada 389-400 above, the range was from 12.03 (highest) to 11.85 (lowest) giving a greater range difference. For Canada 401-436 above, the range was 11.86 (highest) to 11.80 (lowest) giving a lesser range difference. The average of all above 389-400 is 11.90 and the average of all above 401-436 is 11.82. Yes, there is a difference between both groups.

Re: 3Dadeo with regards to the above, one can now be referred to the article entitled "The Canadian Stamp Perforation Change of 1962" (Corgi Times, January-February 2013, Volume 21, Number 4, Whole Number 124, Pages 62-63) where it maintains that Canada # 399 (not # 400 or # 401, # 405 as above) is the main stamp in this perforation change.

Joqil, thanks for the clarification. I knew I had read about that recently.

Found some more information in BNAPS (British North American Philatelic Society) BNA Topics, Second Quarter, April-June 2013, Whole Number 535, Volume 70, Number 2, Page 30. Also, "The Canadian Stamp Perforation Change of 1962" at www.rotaryperforator.com and on different online search engines like google, yahoo, bing, etc.