I've been on the hunt for another of these brilliant puzzle-type boxes made to hold sewing machine attachments since finding (and immediately selling) one a few months ago--and here one is! Patented in 1889, the oak wood box is constructed of four hinged parts with triangular shaped ends, which unfold to reveal a gray velveteen interior designed to hold Singer sewing machine attachments. (And in fact this one came loaded with a full set of parts, which I've removed as they make it pretty heavy--and full-- but I'll happily include them if desired.) It folds back up elegantly to form a rectangular box with square sides, snapping closed at the top.
This particular box features the original oak stain and mark on the front reading "Patented 1889, February 19." There is one section of chipped wood on the corner of one side and some wear to the wood, as documented in photos. The box measures 6 1/2" long by 3 3/8 inches wide and deep.