Z By a ROYAL | LETTERS } PATENT. | As supplied to H.M. the King of Spain. . By pressing a pair of smali buttons on the outer rim of the board, the pieces are secured firmly on whatever squares they may happen to be; while a counter pressure on a button in the inside as immediately releases them.…
Chess · Periodicals · Periodical · British
Internet Archive · Public domain (published before 1931). Free to use for anything.
