Please excuse me if the new PG has this listed, I missed out being able to purchase the new PG at the DJIC in Toccoa, GA yesterday

I was going through a box of insulators I recently acquired and trying to ID this insulator I noticed that it has MLOB. There isn't a variation in the PG for MLOB on any Brookfield 164. Has anyone else noticed a MLOB on a Brookfield 164?