RSPB, Black Oblong Boxes

A set of three 90-piece circulars featuring bird paintings by David Binns which he produced for the RSPB.

These come in black rectangular boxes 9" x 6" x 1" deep instead of the cylindrical tubs used for all the other miniature circular wildlife puzzles.

A description and guide picture is on the lid.

This series thought to have been made in 1974: more precise information welcomed. None had index numbers.