Free Online Perforation Gauge. Perforations or perfs in a stamp was an innovation introduced in 1854 to allow postage stamps to be easily separated and removed for use. rather than individually cutting them by hand from imperforate sheets. 7.0k members in the philately community.
HonorBilt Perfectogauge Stamp Perforation Gauge ebay.com
The perforation measurement is obtained when. by sliding the gauge up or down. each slanted line on the gauge intersects a perforation tooth exactly in the middle. all the way along the gauge. including the very last line. Buying a sg instanta gauge from sg on ebay. shipped to my door in denmark. costs usd 12.59. If a stamp has 11 perforations in this distance. it is defined as perf 11.