The chip is probably from the late 40's or 50's.
GI Forum is similar to a VFW but it is only for Spanish veterans of US Military service. Garden City post had slot machines and table games until the state of Kansas passed a law banning them. VFW post had slots and table games also.
Information curtesy of my brother who has lived in Garden City since the end of WWII.
If you have traders I am interested.