Kee - I would suggest that chandeliers and ebay do not mix.
I think it will be hard to pick the date as these are made for the italian market and for hotels etc [some exceptions of course]. They still make designs from the 50's to order and yours could be any time since the 50's but I suspect that it is a 70's piece, no knowledge just the look.
If you plan on keeping it just put it up and enjoy it. If you plan to sell it you will need some specialist advice on where to auction it. Like everything they will come back into general fashion someday.
Just a thought - my friend who sold his chandelier is gay, and the couple he sold it too are gay too. So maybe it is a thing that has some traction in that market, and they generally know quality and value when they see it.