<a href="https://en.wikipedia.org/wiki/first_day_cover" class="extiw" title="w:first day cover">w:first day cover</a> dated 15 August 1963 Celebrating the Centenary of the Red Cross, depicting Florence Nightingale and postmarked at the place she was buried
<a href="https://en.wikipedia.org/wiki/General_Post_Office" class="extiw" title="w:General Post Office">w:General Post Office</a> issued the stamps
Scan of original cover