For sale is a fine antique steel caliper / divider, apparently unmarked.  The piece is 7 3/4 inches long, and it is about 1 inch wide at the pivot.  It has tapered arms with incurved tips and knurled disks at the pivot.  There are no marks.

Condition on the piece is fairly good, with just some surface rust and regular wear from use.  A fine old tool!