Sheer, stratified sandstone cliffs drop straight to a still sea in this real photo postcard of Dunbar Stack on Scotland's Caithness coast, an isolated rock pillar standing apart from the cliff face like a sentinel. Published by a small local firm working out of Wick and Thurso, it's a rare documentary glimpse of one of the far north's most dramatic and remote coastlines.

• Caption: Dunbar Stack
• Publisher: Johnston, Wick & Thurso
• Status: Unposted