This probably was among the last pintype insulators manufactured by Hemingray. As you can see it has nine dots following the 1957 mold date which brings us to 1966.

It is very possible Hemingray made a big, final bunch of these during that year and offered them in 1967 as carryovers until supplies ran out. That was the year they are known to have discontinued making insulators. I believe there is a TS made by them with the 1966 date as well. I have never heard of any Hemingray glass with a 1967 year of manufacture embossed on them.

Do you know of any other Hemingray designs from 1966? Has there been any 1967-dated ones located? I will update this posting with any factual information received.

Photo from an eBay listing.