What year regulators had the small dime size dimple next to the terminals? Have 2 dated 329 which I figure means 32nd week of 1969.

I think that ended at the end of the 71 model, but I'm not sure? You thinking about buying one?

Already have two .I was just thinking about that small bump that's not seen on many high $$ restored cars.

I have three NOS ones, two Mopar, and one Nehof, and can't use them cause they over charge. The repo batteries can't handle over charging. So I took a new one that works as it should and made a bump on it and had it stamped with the correct stamp. I guess 40 years of setting on a shelf takes a toll on them.