The earliest-known Monopoly game set

Now being offered as Lot 232 in a sale by Sotheby's of the toy collection of Malcomb Forbes.  This is a handmade set from 1933...

This is the earliest Darrow set known to survive, the only one of circular shape, and the earliest to include rules. Complete game-set, handmade by Charles B. Darrow in Philadelphia about 1933, containing more than 200 pieces, including the manuscript playing-surface, pen-and-ink and gouache on a circular piece of off-white oilcloth (33 1/2 in. diameter); the carbon typescript rules-sheet; and the playing-cards and -pieces (typescript deeds, typescript draw-cards, hotels and houses, bank-notes, and tokens). Partially displayed in a lucite case.

Yours for an (estimated) $60-80,000.

Via Dinosaurs and Robots.