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I did notice that. The fact that there is a pre-printed stamp, has a postmark, and has been through a postal system would qualify the item as "postal history". I see one even has a "censored" stamp on it which would make it more interesting. I am not too sure, but I thing the printing of the stamp was the way bulk posting was done by government departments.
Best bet would be to scan a couple of them and email them to experts such as Philatelic Friends or Sandton Stamps and Coins.
Are these letter heads of interest to stamp collectors or more military
A lot of people do collect these, they could be classified as either military or philatelic items.
They were used as is or by sticking on extra stamps, thus making them more interesting.
If I were selling these, I would list them either under Stamps FDCS or Militaria Documents/Letters.