Hi, thanks for your help with this Ivo, very much appreciated.
I don't think it had a stopper, the glass inside the neck is very narrow and completely smooth. The underside also, no pontil but evidence of wear.
The gold on the upper part hasn't disappeared, just the poor quality photo. It's all intact.
The gold inside the mitres (as you put it) is quite worn, it's patchy in parts. I've taken a couple more photo's. You can see it's quite worn.