Coil stamp

Coil stamps are those sold in strips, typically from vending machines.
 * Coil stamps often have two parallel imperf sides. This makes them less likely to jam vending machines.
 * Syncopated perfs are also used. See: Syncopated perfs.
 * Some coils are perfed as the regular issue making them hard to tell apart. In certain cases they are different perf gauges. Sometimes, a clean machine-made trim on two sides, which might mean trimming off perfs, identifies coils.

 File:US 5c rotary horiz coil.jpg|US 1919 5c coil pair. File:Neth 40c synco.webp|Netherlands syncopated perf stamp (horizontal coil). File:Ireland Harrison coil.jpg|Ireland Harrison and Sons printed coil stamp, identifiable by overprint size, characteristics and ink. A horizontal coil – note the machine-trimmed perfs at top and bottom.



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