1963 Nature, phosphor, Brownsea Island postmark

16th May 1963 National Nature Week with phosphor stamps and Brownsea Island special postmark. PTS cover and Sanders cachet address. The island is owned by the National Trust and is one of the few places in southern England where red squirrels thrive.

For most issues between 1962 & 1967, stamps of identical design were issued both with and without phosphor strips. £150 catalogue value.