Pin perf

Pin perfs are indeed created by using sharp pins to provide stamp perforation. They may or may not be regularly spaced (so a gauge can be used to measured it). Sewing machine perfs can be considered a subtype of pin perfs, though those perfs are normally irregularly spaced.

Calling the result to be like we all might expect of machine-made perforation holes is a stretch. Holes are typically tiny. So the line of perfs might be enough to separate stamps from their panes/sheets, but the separation always causes rough edges and (often enough) tears and faults. So yes, pay more for sound stamps but don't pay too much for very faulty stamps. Most existing pin-perf stamps today are going to have tiny problems that should be accepted but not necessarily bought at full catalog price.  File:Saurashtra 3p violet rough.jpg|No rounded corners or tears here. This is about as good as it can get with a pin perf stamp. 

[[Category:P]]