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Maarten · 13th Apr 2021, 8:41 pm

The only use of WWY I'm aware of, are Philips date codes on assemblies and equipment, up to the mid to late 1960's.

Philips later did use non-existing week numbers to indicate months and quarters, but I don't think anyone else did that either.

I'd guess the 027 date code could be an IC that was replaced later on.

13th Apr 2021, 8:41 pm	#13
Maarten Dekatron Join Date: Dec 2007 Location: Haarlem, Netherlands Posts: 4,203	Re: National Semiconductor IC batch codes The only use of WWY I'm aware of, are Philips date codes on assemblies and equipment, up to the mid to late 1960's. Philips later did use non-existing week numbers to indicate months and quarters, but I don't think anyone else did that either. I'd guess the 027 date code could be an IC that was replaced later on.