NICHOLLS NO. 100 STANDARD TAKE DOWN FRAMING SQUARE IN ORIGINAL SLEEVE

24" x 16" assembled. White ink is still bright. Black finish 95%+ clean and intact. Overall excellent condition noting there are a few spots of corrosion which show the copper wash under the finish. Lock button pivots fine. "PAT. APR. 23-1901". 

Reads, "NICHOLLS MFG CO OTTUMWA, IOWA MITER CUTS FOR POLYGON HEXAGON 24-14 HEPTAGON 24-11 1/2 OCTAGON 24-10 MONAGON 24-8 5/8 DECAGON 24-7 3/4 UNDECAGON 24-7 DODECAGON 24-6 1/2"

Patent information can be found here via datamp.org