The link :
http://www.rpsc.org/Library/SmallQu...l_Queens.htmThe basic perforation measurements of Small Queens are 12, 11.75, 11.5x12, 11.75x12, and 12x12.25.
" First Ottawas are given in the catalogues as being Perf 12. Very few are apart from first printings, and accurately these will read on an original 'Instanta,' approximately 11.9 all round. The standard gauge for First Ottawas is 11.75 all round (accurately approximately 11.85 – I say approximately because one of the endearing features of early line perforators is that the pins were not mathematically equally spaced). Any Small Queen gauging just under 12 or about 11.75 all round is almost certainly First Ottawa.
The early Montreal printings gauged 11.5 x 11.75, then 11.5 x 12, later 11.75 x 12, then 12 all round, and finally 12 x 12.25. A Small Queen with any of the first three measurements is a Montreal printing.
Second Ottawas are usually 12 all round. Very occasionally, they can be 12 x 12.25, which is why paper must also be considered in one's determination "
This link is found here :
http://www.rpsc.org/Library/SmallQu...l_Queens.htmunder "perforation" located at the bottom of the page among many other instructive links
Posted 02/13/2012 2:40 pm
