Robert, Those are some neat old chips. They look to be in the time frame of the chips in the ads on pages 405 and 408 of Dale's book. One thing that I can never get an answer to is, who actually made the chips? several companies distributed the same designs.
I think all of us old chip collectors have chips in this time frame that are with and without ink. Were they sold without ink at a cost reduction? Do you have any idea what that "BR or RB" logo on the box stands for? If these chips are not original to the box, perhaps someone making the chips was taking odd chips home to make his own set.
Above I meant collectors of old chips, not old chip collectors