1969 shocks

[T Billigen]

How do they date the 1969 shocks, with a Julian date or with the letter and number system?

[Mr70]

Julian Date Tom.
Example:after part number is 137 70 deciphers as 137th day of 1970,May 16th 1970.

[T Billigen]

Thanks Rick, that is what I thought but did not know for sure.