That is an old Fairchild / Cal-Tex part number (circa 1978).
IF you find old Radio Shack blister pack parts, look for part number: RS1756 -- that was the Cal-Tex clock IC.
Here is an old Datasheet / Application note for this MOS/LSI Clock Calender
Can you use the NTE2060/1 ??
These do not have multiplexed outputs.
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