In December of 1962 the Derby Turf Club was owned 75% by Harry Hurley and 25% by Frank Cobert.
In an article of December 18, 1962, partner Frank Cobert was approved by the gaming commission to buy an additional 25% interest from his partner Harry Hurley for $17,500. Harry Hurley also sold out his remaining 50% interest to Harry Gordon for $40,000.
In an article in June 26, 1965 Frank Cobert was described as a "former" licensee of the Derby Turf Club and he was applying along with William Dark to open the North Las Vegas Race and Sports Book.
Take a look at the phone numbers on this old matchbook.
Just 85 and 663.
No area codes or prefixes yet.
Here's a matchcover with a prefix!
At this point they have dropped the "words" from phone exhanges and have just gone with numbers.
But still no area code yet.
So it's a little newer and show's owner
You can follow the age of matchbook or other advertising just by looking at the phone numbers.
The first one above
is Phone 85.
The middle still has the 85 but it's now expanded to DUdley 2-0185