Interlock

Presented in matching, book-style boxes, this extensive range of cardboard puzzles are smaller sized cousins of the Waddington's Giant range.

Earlier puzzles from the mid 1930's sold for 6d (2½p), later increasing to 9d and then 9d + 2d purchase tax after late 1940.

The first ten puzzles were indexed with roman figures after which the sequence was numeric, starting with no. 51.

Details courtesy of Jerry Mortimore and from Barbara Middlestorb's archives.