re: Random Ceylon Stamps Probably nothing spectacular.
Rare semi-modern stamps are also generally rare.
You might have some better variant (uncommon perforation, fault or watermark) but to find out you need to check the catalog listing
If you don't have a catalog the sites mentioned like Stampworld or Colnect will be very helpful
If you find something really unusual or unknown then submit it but you need to provide a decent large cropped image of a single stamp.
The stamps you show seem to be mainly in the 1940-60 period and are desirable Some decent one can be found.
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