B68-519 MODEL SHOP PROTOTYPE. Convex Sole Block Plane. Basically a Type 1 Stanley No. 64, with the nonadjustable throat and wooden knob, with the sole slightly longer and cast in a convex curve to cut hollows. Model shop number "64" marked in two places. Japanning on the cheeks and lever cap is about 50% but bed is intact, wood and metal otherwise clean. S casting mark on underside of lever cap. Another idea from the model shop that never made it into production. From the collection of Paul van Pernis. Good 1500-3000