MINT KELLOGG 1880 PATENT BOXWOOD & BRASS FOLDING TAILOR SQUARE

24" by 12". Superb condition with original finishes. Dead straight and flat. Brass lock pivots to lock at 45 and 90 degrees. Stamp reads as follows:

"THE KELLOG FRENCH TAILOR SYSTEM PATENTED DEC. 21, 1880
SQUARE PATENTED. DEC. 25,1883. BATTLE CREEK MICH."