Syncopated perfs

Syncopated perfs or syncoperfs, are a deliberate pattern of interrupted lines of perfs. The most famous are those of the Netherlands in 4 different styles, used from 1927 to 1933 on some definitives and a number of semipostal sets, issued alongside "normally" perforated stamps. They were originally made this way to prevent them breaking apart when made into coil strips and sold.

US private vending machine coils can have syncopted perfs.

More recently, a die cut design is used in syncopated perfs as a security measure to deter forgery.

 File:Neth 40c synco.webp|Netherlands 40c from the 1928 syncoperf series. File:Netherlands 6c semi synco.jpg|Netherland 1929 6c semipostal block showing a different style of syncoperf from the stamp at left. File:Great Britain L2 Castle.jpg|Great Britain used this style on several issues starting with the Castle high values in 1992. 