Todd,
It is a little difficult to see the detail of your Dad’s 2x3 camera to make an educated guess as to date of manufacture. However, below are three links to some pretty good sites for info on Graflex models - lots of pictures. It may be of some small interest that all of the pictures of Mike Stackhouse with a Parker that you will find here on the PGCA site were probably shot by my Grandfather using a 4x5 Graflex - his camera of choice for which he had a reputation. In the 1960s we were still using 4x5 Super D models synced for strobes in the studio making people story photographs in both color and b/w. At that time we were running eight active darkrooms for processing and printing - today it’s all soulless computers and scanners and software.
https://en.wikipedia.org/wiki/Graflex
http://graflex.coffsbiz.com/
https://graflex.org/