History of CMOS IC(No. 6)

The low power CMOS IC [Integrated Circuit] was one of the key developments for the quartz watch.

Seiko†

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]