Hyphen hole perf

Hyphen hole roulettes are made up of rectangular slots instead of circular holes. It is found on the US "battleship" proprietary tax stamps.

This is often visually hard to tell from a roulette on a single stamp. However, hyphen-hole perfs are a unique gauge (perf 7) for the Battleships, so a perf gauge is all that is needed.

 File:Hyphen hole perf.jpg|Hyphen-hole perfs are evident when stamps are in multiples. Compare with the rouletted block at right. File:Rouletted battleships.jpg|A rouletted block showing the simple cuts made by the process. 

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