Apologies if this is an old bugbear, but as I educate myself on the SQs, I wonder about the 11.75 perforation. When Unitrade rounds, would an 11.75 be rounded up to 12? Is it only the 11.6's that are considered 11 1/2?
Scott uses around 1/2 for older U.S. issues and 1/10 for newer ones. It would depend on each is issue.
For Canada BABN issues from 1930-1935, it is suggested that 1/4 be used since flat plate sheet and booklet issues are 11 x 11, rotary press sheet and booklet issues are 11 1/4 x 11 and rotary press coil issues are 8 3/4