Perforations on stamps.

[belladora2011]

Why don't sellers list the perfs on stamps especially when selling single stamps. There are collectors out here who like to collect all perfs for a certain stamp.

[putney32]

--because the majority of stamp sellers probably dont own a perf gauge or dont know how to use it if they do happen to have one

been a dealer for the greater part of my working life, you'd be surprised how many collectors have no idea how a perf gauge or watrmark detector or Thirkle position finder work.