Jim,
As I recall, these history of logos strikes are limited to 525 (source is Cohenour) and numbers 5 and 6 were never issued. Strikes 1 through 4 were issued during a striker related event, and you had to trade 4 in for a $40 strike. Most of these probably ended up in the possession of club members as the price has not risen to that usually associated with a 500 issue strike. Logos 1 through 6 were later issued with the Barrick logo. Hope this helps, none to trade here however. George