Thanks for all the info till now..
It's a pity that I did not know about Zeus; one just passed away from ebay a couple of days ago.
About these Maillard 700; I guess not all of them has Dural cogs, cause I was watching a couple of them and they did not seem to be so much sought after..

It would be much more greater if you are able to give some numbers (weights ) on these models. I really looked after this info on the web, but couldn't find so much. Maybe I don't know where to look at??