Rare vintage 12” Lufkin No.888 folding boxwood ruler with extending 3” calliper.
In good vintage condition. The measurements are still clear and the calliper slides smoothly.
Please see photos for more details. 
Folded dimensions:
Length: 83mm (3 1/4”)
Width: 27mm (1”)
Depth: 10mm (3/5”)
Weight: 47g