Information about these Scottish Island 'locals' is sketchy at best but I would describe them as Semi-local and semi-bogus.
There was a kind of 'local' service on Davaar from 1960 until 1972 where the boatman would take letters for the visitors to the mainland for a fee. Stamps were produced.
Later issues are bogus as scrupulous dealers got on the bandwagon. I believe your 1976 issue is one of those.
Gairsay in the Orkneys has a similar story but here the owners of the Island produced the stamps and it is believed they did it partly for extra income !
The same story abounds about the Scottish Islands !
