Looking through my own stuff, I came across these postmarks. I'm not aware of any Gaelic stamps as yet.



Unlike Welsh, the Scottish Gaelic language has no official status... only "equal respect with English". Issued in 1979 this postmark was a philatelic first when the Post Office authorised the franking of all outgoing mail from Stornoway for a month during mod nan eilean 1979.
Neo choltach ri Cuimrig chan eil status oifigeach aig Gaidhlig ann am Breatunn ged a tha iomadh buidheann ga cleachdadh, leithid Oifig a Phuist bithidh Gaidhlig agus Beurla airson a cheud uair riamh air litrichean agus eile a falbh a Steornabhagh eadar an 17mh de'n t-Sultuinn agus an 12mh de'n Damhair.