Recommended reading in the Antique Web:

DON'T LOSE YOUR MARBLES
by Wayne Mattox

Noted antique dealer, Elmer P. Thinkwhile, and his long-time sidekick, Professor JP Livingston, where strolling New York City's Central Park after having lunched with the famous American furniture dealers, the Sacks. Near a statue of Horace Greeley, they came upon a group of tykes sitting around a chalk circle playing marbles. Thinkwhile stopped. His trained eyes bulged. Half the marbles in the game, were not just marbles, but valuable antiques! The diameters varied from 5/16" to slightly under 2.5 inches.   CONT'D