About the collection

The parameters of the security envelope collection are simple: the envelopes may be gathered from anywhere, may be new or used, but only one example of each will be retained in the collection.

You will find that there are many very similar patterns on envelopes in the collection, but a design is only considered a duplicate if it is truly of the same manufacture and origin. Size, presence and number of windows, pattern color, adhesive type, envelope construction and manufacturer logos/codes can all differentiate similar looking envelopes.