If these are damaged, the stamp is worthless. There is no need to include the postmark. There are 2 sub-groups. These are usually from an album and can be easily damaged. There is greater potential value in stamps of high values.
Metered postage is of no value as there is no actual stamp.
This also applies to the printed stamp on air letters. We have had a great response to the stamp drive, keeping us really busy. Our thanks to all our contributors for their continuing support.