That would reasonably suggest that it was not a recent production unit.

Johnson controls makes many different labeled batteries. Including, Interstate AND Optima! The Optima batteries are not what they use to be. When Optima was it's own company they were outstanding. Nowadays you are better off with a group 49 from any parts place or Wal-mart. There is only Deka, Exide, and Johnson Controls left. Lots of labels, 3 manufacturers. I think Deka is the best built one's. They even make a group 49 AGM now.

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1985 Mercedes Benz 300SD, TMU
2015 Chrysler 200S

Yeah, I thought of that as I wrote it. Price really jumped too since I bought it. I also bought one two years ago for my ponton. All is well there so far and it gets really limited use.

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Len
'59 220S Cabriolet-SOLD and living happily in Malta
'83 240D 351,500 miles original owner-SOLD
'88 560SL 41,000 miles - totaled and parted out
https://sites.google.com/site/mercedesstuff/home
'99 E300 turbo 227,500 miles
'03 SLK320 40,000 miles - gave to my daughter
'14 Smart electric coupe 28,500 miles
'14 Smart electric cabriolet 28,500 miles
'15 Smart electric coupe 28,000 miles