Coil stamp

As each stamp was worth either a half or one old penny and 240 pence made up one pound sterling, the coils were in rolls of 960 or 480 each.

In the United States, vending machine companies began to experiment with the automated dispensing of stamps.

Early efforts to break sheets into strips manually did not work well, since they were prone to tearing and jamming, and soon the companies began to request imperforate sheets from the post office, cutting those into strips and punching holes of various shapes between each stamp.

The first US government-produced coils appeared in 1908, produced by pasting together enough imperforate sheets to make rolls of 500 or 1,000 stamps, cutting them into strips and perforating between.

The cylindrical plate used on a rotary press has a seam where ink tends to accumulate, resulting in joint line pairs.

This 2-cent coil stamp of the US 1954 Liberty series was used heavily throughout the 1950s and 60s.
A coil strip of British 1957 Scouting commemorative stamps with the trimming of the perforations on one side clearly visible.
A vertical coil pair with a joint line, US 1917.