18″ accually measures at 17-1/2″ across. Width of wheel is 1-3/16″ and the groove is 3/16″. I do believe this fantastic piece retains almost all of the original japaning. Probably 95/97%, Paint is just not this thick and the look cannot be imitated. Superb condition with all pieces and parts present and working. No cracks, No fixes, No bull. The item “Grouts excelsior, Jewelers lathe, watchmaker, treadle lathe 18, excellent cond” is in sale since Friday, April 13, 2018. This item is in the category “Collectibles\Tools, Hardware & Locks\Tools\Other Collectible Tools”. The seller is “bullsntools2″ and is located in Wadsworth, Ohio. This item can be shipped to United States.