I think this is probably a later one, I think it may be end of the '70 (with that neck brace), it may be contemporary to the Borgani MARK VIII that I once found somewhere
Nice though this is , the price is anybody's guess. It looks very nice and if in playing state and to the right person may fetch up to €1000 , but may equally remain unsold, there isn't a " market" for those horns, all sales are rather more episodes , but again one only needs one buyer. A dedicated collector of Italian horns may fell in love for this for reasons that others may not consider important.
By the way look at the price of a similar (but not as nice an example) fetched on Catawiki
Value, is very much in the eye of the buyer. Yours looks better