The low power CMOS IC [Integrated Circuit] was one of the key developments for the quartz watch.
RCA were the first US manufacturer to offer CMOS chips.
81473 - Used in the 570, a very low profile ceramic package, with 3 or 4 figure date code
SC10018F, as used in J-L Masterquartz
Supplied IC for Casiotron 04
Supplied IC for Casiotron 02 marked "MSM5920 4Y32" [for 32nd week of 1974]