Thanks, Frank and Marcus - E. Vogel it is! I wondered whether one of the letters in the second mark was "H" and corresponded to Haida. Maybe they are 2 Hs perpendicular to each other?? Meisterdorf is close enough that Vogel may have associated himself with that name, I suppose.
That's a nice array of Jagdgläser, Marcus, thanks for drawing my attention to it. I've been to that site a few times, but don't remember those...obviously need to explore it more.
Frank, I thought the Lobmeyr mark was J L W, the W standing for Wien. No?