There are tiny tacks in the surface of the ruler, which insert into holes on the opposite side for stability when closed. See close up photo. It looks like a bit older version of the 268 than others I have seen, with no patent mark, no manufacturer mark, and no Made in USA.
This antique folding ruler from Stanley is a beautiful piece with a rich history. Crafted from boxwood and brass, this 24 ruler features four
Antique 24” Boxwood Folding Ruler Wood & Brass 4 Sections No. 68 (1908)
Rabone Boxwood Ruler
Antique Folding Ruler
wood folding ruler 24 - warranted boxwood - tools - by owner
10 RIGHELLI IN legno VINTAGE EUR 34,63 - PicClick IT
VINTAGE 24 FOLDING WOODEN & BRASS MEASURING RULER No 7012 £5.99 - PicClick UK
Boxwood Ruler
BOXWOOD BRASS ANTIQUE STANDARD TOOL RULE RULER 27 unionville ct w slide $80.00 - PicClick
Vintage hard to find 24 inch folding wood and brass ruler. Boxwood brass no. 268 made by the Master Rule Manufacturing Co. In New York USA. In good
Rare Master Rule Manufacturing Co. 24 Boxwood Brass No. 268 Folding Ruler
MASTER RULE #268 Vintage Folding Pocket Ruler 24 Four Fold
Vintage hard to find 24 inch folding wood and brass ruler. Boxwood brass no. 268 made by the Master Rule Manufacturing Co. In New York USA. In good
Rare Master Rule Manufacturing Co. 24 Boxwood Brass No. 268 Folding Ruler
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Vintage Stanley Rule & Level Co. No. 68, 24in 4-Fold Brass and