Okay, yours has a different base shape, more curvy, mine are straighter or shape outwards towards the base.
I've just found one of mine with a similar shape base to yours which has a ground out circular pontil mark but not polished, it's lighter than my others which I am pretty certain are Nazeing / Elwell.
How heavy does yours seem?
The problem with these bowls is the more you come across the more variety of shapes and sizes you see, bit I haven't seen one in your colour before. In all honesty its probably going to be difficult to give it a positive attribution!
you could have a look here
http://www.ysartglass.com/Otherglass/Nazeing/NazeingG01.htm to see if you can spot one like yours!
Roberta