This is a Stanley No. 36 1/2 Right Hand Boxwood Folding Caliper Rule. It is a One Foot, Two Fold model which is 1 3/8 inch wide. According to the August 1941 edition of the Stanley Tools Catalog No. 34 it is "One of our best sellers".
The upper part of the brass square joint has the initials SCS stamped in from the original owner, which adds to the character of the tool,
Each tool had been carefully cleaned using orange pumice hand cleaner and the brass parts have been polished using Simicrome Polish.
They are perfect to display as works of art or give them a job in your workshop.