There are some boutique manufacturers which reproduce the original logo batteries but some of those have gotten pretty much universal bad reviews for short life from several members here, myself included. Here is one such company but I don't recall if I bought theirs or know if this is one of those reviewed by others.
http://www.antiqueautobattery.com/ There is another option that might suit your purpose. The false cases for the Optima batteries are carried here
http://www.tartopper.com/ and by several of the various club regions. When installed in car, they look very authentic. I have Optima batteries both in my 56 and modern car & so far have been very satisfied.
Also, some members report painting the modern batteries all black which disguises them fairly well.
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