This chip is N4549 in TCR and is listed as a "prototype." Dale Seymour bought these and many more prototype Nevada chips from a former Bert Co. employee. They were never used in the casinos and were unfinished. The edges were not milled; They are rounded and show the raised center edge line made by the junction of the two halves of the mold. Most of these Burt Co. prototypes are very desirable to collectors and have brought fairly high prices.