"The last US Chip Guide by Campiglia & Wells refers to research by Doug Saito through Harvey Fuller's notes and James Campigilia and states that El Rancho Dio was opened by Frank and James Dio Data in 1942 and had craps, roulette and 21. Val Sneed took over the games at El Rancho Dio in 1946. Norman Khoury took over in 1949."

I agree with Greg who stated the above. Also El Rancho Dio closed in 1950.

The only problem with this is, The arrowdie mold was made in 1953. The 1st order was for the Sands in LV.
The last order was for the opening of the Four Queens in 1966. After that order the mold was returned to the owner at the time, The Fremont Hotel Casino, in LV as "NG." (No Good)

If you want the history of the Arrowdie, click here.
http://www.marlowcasinochips.com/links/genetrimble/genetrimble.htm

This article was written with over 1 year of research and with access to the Burt records. Burt was the sole producer of Arrowdie chips.