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Bi-color rotary unit led to note error

BiColorRotaryUnit

By Peter Huntoon

How did this strange misaligned overprint error occur where the green Treasury seal landed on the same spot as the right serial number?

A logical assumption would be that the green elements are printed on one mono-color unit in the overprinting press and the black on another, thus making this error impossible.

This note was overprinted on a COPE numbering and sealing press. An interesting characteristic of the COPE machine that overprinted this note is that the seals and district identifiers were printed from one rotary unit in the machine and the serial numbers from a second unit.

The unit with the seals and district identifies was a bi-color black/green unit, whereas that with the serial numbers was a mono-color green unit.

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