Unless someone can challenge or better David Spragg's answer, looks like he is the chip winner. Response must be by 11:00 pm est today.

David's answer was the International name change to Hilton International with a time period of 7 months 1969-1970. According to TCR new chips were issued for Hilton International which was again changed to Las Vegas Hilton in 1971. TKS to all who responded.