Whilst attachments for European made Singers came in cardboard boxes or tins, in America attachments could be supplied in a wooden fold out box which was patented February 19 1889. Usually associated with treadle machines the box was well made with dove-tailed joints and brass hinges.
Singer Treadle Sewing Machine Attachments Puzzle Box – Patent 1889
This is a reproduction copy of the 1889 patent for this famous Puzzle Box. It consists of one detailed drawing page giving all the details on how it was made.