Denmark Parcel Cards

For what purpose and how are these cards used.

Is there any websites about these cards?

There seems to be a lot of these in different types.
Faroe Islands collection:
http://faroestamps.dk/Collection_c/...celcards.htm
http://www.faroestamps.dk/

The image shows a parcel address card (adressekort) from Denmark for a domestic parcel. They were franked with postage stamps and some of the higher values are frequently found on these cards.

In the lower left corner is written K 24, which is the order number of the card with 2-74 A6 in parenthesis (round brackets) for the month/year and size of print.

In those days the addresses of both sender and recipient had to be written on the parcel as well, and then the number label - in this case "053 Løgstør" - was added to the parcel for fast recognition when sorting.