Correct reference is 168.0056
Not quite sure if this dial originally had tritium or not. By the time this watch was made in the mid-'70's, the watch companies were switching over to luminova. That means that the dial needed to be charged (exposed to light) before it would glow.
Try taking it out in the sun, or using a strong desk lamp. Then see if it glows in the dark.
gatorcpa
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