Coil line pairs often command a premium. A guide line pair of 5¢ blue George Washington coil stamps, Scott 396, is shown in Figure 3.
The coil manufacturing process also created what are called "line pairs". If you look at the diagrams above, you will see that the sheets of 400 had lines running horizontally and vertically down their centers.
Pair of coil stamps, joined vertically or horizontally in the case of the City Type Coils, and horizontally only in Bureau issues. In Bureaus, one also finds gap pairs (qv), line pairs (qv), and combination (line and gap) pairs (qv).
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Later a rotary press was adopted, which eliminated the pasting stage. The cylindrical plate used on a rotary press has a seam where ink tends to accumulate, resulting in joint line pairs.
 See also: Stamp, Coil, Plate, Line pair, Used
  
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