Covers
From Stamps of the World
Covers
There are many different types of covers:
Before the invention of envelopes letters were folded and are known as Folded letters sealed in wax or tucked in.
Here is a brief explanation of the types.
Prephilatelic
Covers posted before a country introduced stamps.
So for example GB covers posted before 6th May 1840, French covers posted before 1 Jan 1849 etc. The postage rate was written on the front in pen to indicate payment had been made or if it was due from the receiver. Handstamps also existed to say a fee had been paid (red) or due (black) on delivery of the letter.
Multiple Stamp Usage
From time to time, senders affix stamps in unusual ways.



