The Salvation Centenary on the Isle of Man was commemorated with four stamps issued on 15 February 1983. These two covers bear the uncommon Castletown postmark (PM). The block-of-four cover is particularly rare, as examples of this issue used in blocks are seldom encountered. A plain private letter franked with this issue is also unusual. The Castletown (PM4) cancellation is of special interest, since Bandmaster Cowley—depicted conducting the band on the stamp—also served as the sub-postmaster at Castletown Post Office.