Although your chip was delivered in 1964, the chips were 1st delivered to V. Camo, 5324 4th St ST Marrero, LA in 1956. Many Biloxi chips were delivered to LA, to operators homes or mail drops to cover tracks. That makes 8 years for sure the GPC operated. Next time I talk to Rip Poulos, I will get a more complete history on the GPC.
BTW, Rip had his gaming supplies delivered to a drug store.