Yep, clearend MHs indeed existed, Sylvania made them as late as 1980. I think Sylvania has always made the diffuse HPS lamps with the clearband finish, Joe Maurath said he has one from 1973.
Well.....I know Sylvania today's MH lamps are sorta clear top....its more of a lot lighter coated than the rest of the lamp...some to look really clear ended! It's cool!
Yuuuup. Unless the ED MH lamps were only a short-lived thing. All I see online now though are the ED Sylvanias. I liked the Sylvania MHs just for the fact that they were BT shape lol. Plus they're good quality but the shape was cool too!