B65-58 IVORY COMBINATION RULE AND INCLINOMETER. Four-fold, two foot with level vial mounted in the edge and scale along the hinge for use as an inclinometer; German silver hinges and vial holder. It strongly resembles a Rabone No. 1190, but is unmarked and we've never seen a Rabone in ivory. One of the edges is beveled. In near mint condition, straight and tight with only the slightest trace of yellowing. From the collection of David Jeffers. Fine 500-1000