Very colorful British birds FDC; a Salvation Army cachet issued by Historic Relics. The cover celebrated the Centenary of the Harwich Citadel Corps (“One houndred years of worship and service”) and has a special Centenary postmark. Very rare cover! the Catalogue value is high (£ 110 – BFDC 2018) – Estimated value at least £ 70 (sold for £65 on Ebay Spring 2017). The cover is among the first issued by “Historic Relics”, I’ve traced covers from this issuer back to 1979.