Envelope linings 1

This pattern forms the lining of a recent envelope. The design is a fairly simple ( but finely engraved) pattern of wavy lines, not unlike Guilloche.

The pattern , strictly speaking, is not a separate piece of paper pasted onto the inside of the envelope, but is rather printed directly on the inside of the envelope itself.

As you can see, from the above image, this pattern also comes in a black/grey colour.
This is one of the more common patterns. I have seen at least a dozen envelopes lined with this paper.