THE HOUSES OF PARLIAMENT

Zag-Zaw line of puzzles was first produced in 1909, all incorporate figurals or whimsies, sold in red or orange boxes with labels on the side or bottom of the box, most without guide pictures. Initially cut non-interlocking but by 1930's became more so. Puzzles have a different cuts so that the same image will come in several versions which means that missing pieces can not be taken from other puzzles with the same image. See also Bob Armstrong's website on old jigsaw puzzles

600 pieces, DISGUISED EDGES, sixty figurals (image and info courtesy of Bob Armstrong's jigsaw website)
listed in two Tuck catalogs but those have 750 pieces and are plain edged