Leo; The chips you have illustrated are obverse and reverse views of two chips.... not four different chips. They are illustrated on page 49 in "Black's Catalog" as CC RES-0 and CC RES-00. Allegedly; they were intended to be given out at a banquet or dinner-dance to "Day One" Resorts employees. However, the (unconfirmed)story goes that the chips didn't arrive in time for the event and were given out at a later date at an employee picnic.