Fuller's has the following:

Thunderbird (Del Webb) 8-21-64 - 9-28-72
Thunderbird (Caesar's Palace) 9-29-72 - 9-30-74
Thunderbird (Del Webb) 10-1-74 - 12-31-76

Herz's Nevada Gaming Checks & Chips shows:
Sahara Thunderbird
Las Vegas, NV
1972-1974

?For whatever it's worth.....???