How To Know If A US Stamp Was Issued With A Straight Edge?

Hello all, if I missed this as an existing topic, please let me know. One of the things I worry about is if a US or Canadian stamp I see on ebay, bidstart, etc is reperforated. I can generally tell once I get the stamp, but if an issue, such as one of the zeppelins, was never issued with a straight edge, then I should not have to be concerned if it was reperfed, right? I have looked in Scott's specialized catalog, Brookman, the Swedish Tiger, but I don't see that information. If anyone can point me in the right direction, I would appreciate it.
thanks a bunch, Yakboomer.

Coil stamps and imperfs are the only stamps "Issued with straight edges" but depending on the plate layout of any particular Stamp, many can have a natural Straight edge. A 400 subject plate is cut into 4 sheets of 100 so where the cut is made, those stamps will end up with a straight edge. This should help explain.

http://www.1847usa.com/PlateLayouts...teLayout.htm

thanks, stallzer. Looking at the 1847usa website does help. regards, yakboomer

If your primary purpose is to rule out reperfs, I would say this is not the way to go. Booklet singles, coils, and fully perforated stamps are all candidates for reperforation. Your time might be better spent trying to understand how to detect reperforations.

You can do an online search. Also, Paul Schmid's book "How to Detect Damaged, Altered, and Repaired Stamps" gives a decent introduction to the basics for US stamps.

One of the best books I ever bought.

Thanks, got one coming. regards, yakboomer