Ekco A104 radio speaker grill.

[Yorkie]

I don't think that fabric on the one on the RMORG forum is original.

The stuff you described was widely used by several makers - I think yours may well look like the 104 featured here:

http://www.vintage-radio.net/forum/attac...ntid=57904&d=1319815341

I've attached a pic of my Pye 'PM94MBQ' which used that type of plastic grille.

Unfortunately, though there are about four versions of the service data for the 104, none of them have a good picture.