I don't know exactly how old this reproduction battery is - it dates to at least 1997 and possibly to 1992. So 26+ years old.
Up until a year ago, I kept it on the floor of the cellar in my basement. It didn't leak, but it was a bit low on electrolyte. I still had the original bag containing the sulphuric acid that was used to fill it, and it had some acid still in the bag so I used it up. When I put it on a charger, it took a charge, enough to start my '67 Monaco (with 318) and drive around a little. It needed to be on a trickle charge to keep it up, but it was surprisingly useable. After I put the car into storage last fall I brought the battery back home, but it started to leak because the upper and lower tray portion of the casing seems to have separated. Maybe a cup of electrolyte has leaked by now.
I'm not sure what I'm going to do with it at this point. Either try to seal it and rejuvinate it, or take it apart and use the shell to house a smaller high-performance AGM battery so I maintain an original look. The number and codes embossed on this battery are:
24-MB-59
CAT. No. 2444562
A-24B
MOPAR ORIGINAL EQUIPMENT
DELUXE
Performance Engineered
From what I can find on-line, the PN is identified as an S24MG battery, 1966-74. Mancini racing sells just a flat-top black plastic cover plate that duplicates the mopar labeling for $70 - but it comes with red caps. It's identified as group-24 size. You can buy reproduction sets of caps that you "glue" onto a suitable new battery to simulate an original look. $25 - $35. Ridiculous.
I don't know if anyone makes a complete, authentic, functioning, reproduction battery as this battery was. Perhaps this battery was the last of it's kind?
Dimensions - for the record:
10.25 inches wide
6.75 inches deep
8.00 inches high (to the back top)
8.75 inches high (to the top of the green caps)
weight: 43 lbs
To me, this could be a group-34 size battery if you measure the battery without the height of the terminals.