This is the second one I've run across now and it may be just the 6 looped down, but maybe the mold broke where the 6 joins to make an 8. Any input would help clear this up. Quite unusual error. Saw this one on a table at the Mid-Ohio show last weekend. Who had it, I forgot?

My CD 257: https://www.insulators.info/pictures/?id=321113063

I bought mine off eBay 7 years ago. Time flies...