Firstly, thank you for your all replies guys and for the help!
Secondly... the seller has sent me new picture of the bass... including the dismounted neck, but since I don't know anything about dating a Fender neck I have to ask again for your help
In addition, from the photos it seems that the pickups are from 1974 (last numbers are 74) .. is it possible that a '76 bass has '74 pickups?
Here's the photo album: [url="https://imageshack.com/a/mNZ4/1"]https://imageshack.com/a/mNZ4/1[/url]