Outer 1849 Thurso to Easdale, with Thurso double rim CDS in blue dated JN 30 1849. Backstamped by OBAN boxed receivers mark in blue dated JY 3 1849. Easdale quarries are famous slate quarries which supplied roofing slate for many of the British Empire’s buildings as far away as Australia, New Zealand and Canada. They have mostly been flooded since the great storm in 1850