R59 Date Code Deciphering
 

Used to know these codes. Little help? J71.....................................10

Got to be in the mid 70s based on warranty sticker dates.

Sept 1977 built at the Anderson Indiana plant. It was not assembly line because it was shipped dry, so it was a replacement battery.

Got it Steve. Thanks - figured you’ve seen a few of these. How do these score in judging relative to the repro batteries?

As Steve referenced,and to add,that's not the number 1 after the letter J,but the letter I for the Battery plant code.
Some Delco plant codes I've recorded:
I=Muncie,Ind.
C=Anaheim Ca.
G=Fitzgerald,Ga.
K=Olathe,Ks.
N=New Brunswick,N.J.
R=Korea
Z=Oshawa,Canada

The Letter I was not used to identify the Month,but it was for the Assembly Plant.
10 is the day this battery was made.

Ah, love the details Rick - thanks. The casing at the bottom states that the battery was made at the Anderson Indiana plant - is that in Muncie? So, if this stamping is near the bottom of the case, why is there a code with the same info on top of the case?

Anderson Ind. is their production plant where they produced the battery casing.
Muncie Ind. is where all the parts came together to make it a working battery.

Thanks Rick.