It's the colour but most of all, how it "works".
This shape is very, very common for "whoever made this", not so common for Monart or Vasart.
What's been keeping me from saying nay to Monart or Vasart out loud, or suggesting anything else, is I'm a bit thrown by the polished blob over the pontil mark, and I'm not able to positively id. Nazeing and I think we need Nigel or Frank.
(I get tangled with Nazeing, Grey-Stan and the so-far unidentified maker, then I found S&W did similar and, I'm sure, somebody else - so I'm keeping quiet.)