B56-550. TRANSITIONAL JACK PLANE. Palmer Patent. Patented in 1857 by J.F. Palmer of Auburn, New York. PTAMPIA I describes this as "perhaps the most significant development in longitudinal cutter adjustment" as it was the first efficient cutter adjustment to be used by major plane manufacturers - in addition to S.W. and J.F. Palmer, the same mechanism was also used by Truman M'Master and Metallic Plane Co. The patent also describes a spring-loaded mechanism to withdraw the cutter on the back stroke, but apparently that feature was too complicated and it was never manufactured. 15-3/4" sole with open tote and 2-1/4" cutter, marked "Palmer's Patent" with the patent date on the cutter, cap iron, and toe. The wood has much of its original finish, a couple of tight checks but no damage. Rated R2 for rarity (fewer than 25 examples) in Larson & Blanchard. Good+ 300 - 600  **ALL ABSENTEE BIDS MUST BE RECEIVED BY END OF DAY FRIDAY JUNE 26, 2020. CURRENT ABSENTEE HIGH BIDS MAY BE OBTAINED BY CALLING (800) 248-8114 UNTIL 5:00PM, FRIDAY, JUNE 26, 2020. AUCTION TAKES PLACE LIVE AT THE CAMP HILL, PA, RADISSON INN AT 9:00AM, SATURDAY, JUNE 27TH, 2020. SEE AUCTION RULES OR CURRENT AUCTION DETAILS FOR MORE INFORMATION**