Antique No. 90 Bone 12 inch Folding Rule Ruler Stanley

For sale is an antique No. 90 12 inch folding rule. Possibly Bone, not for sure on the material - see pictures for more. Is marked No. 90, no brand name on it. Possibly Stanley?. The markings on the inside are more clear, the markings on the outside are still there but are more worn. Some panels are discolored more than others. The outside The bottom edge on one of the sections has some small chips (see pics 7 and 8).
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