B68-518 MODEL SHOP PROTOTYPE. Round Cutter. A No. 55 body with a wooden attachment to cut a 1-1/4" round, similar to the hollow and round attachments furnished with the No. 45. The wooden attachment has a model shop number 1540 painted on the toe. Nickel plating is faded and the tote has a crack. Never put into production. From the collection of Harold Unruh. Good 500-1000