Battery expanded from charging

Look at new batteries verse old batteries. The plates made now are thinner than the plates made in 1974. It seems to me the cases are thinner also. The next time at Wal-Mart, do the Charmin test on the old style Batteries. Be careful or you will have acid on you.

As for being "period correct". I would say that is in appearance only. Not the plate count, the case thickness, or the materials used in making the cases.

Mike