Imperforate Europa 1963 sheetlet (2s6d) from the Isle of Stroma, depicting a cod and inscribed “Stroma to Huna” (the local post service for which the stamp was supposedly issued).
U/M / Unmounted Mint / MNH / Mint Never Hinged.
Stroma is a Scottish island, located in the Pentland Firth between Caithness and Orkney.
Background information on the 1960s labels that bear the island's name is reasonably hard to come by. However, the island's abandonment by its last permanent residents, in 1962, suggests that its stamps were produced for collectors rather than as part of any genuine local postal service. Either way, the stamps of Stroma count as Cinderellas by virtue of the island being part of the UK, and not an official postal administration in its own right.