Antique 6 Inch Bone and Silver Ruler with Caliper stoneware funnel This Saltillo

This Saltillo

but I might do with this one

sometime between the 20s and early 50s

removable by unscrewing

Antique 6 Inch Bone and Silver Ruler with Caliper stoneware funnel This SaltilloStanley and a few other tool makers produced beautiful bone rulers, which bear their marks, but I've looked and looked and not found another like this one. There are no readable measures on the bone, but on the both sides of the silver end on are marks for 4 and 5 inches, and then the caliper pulls out to measure 2 inches, with each inch divided into 32nds on the flip side. Probably more of a beautiful thing than a super useful tool these days, but