As someone with (hopefully) a real 1977 Lefty precision, this is wrong at so many levels.....I don't think any precisions had through body strings in this period. The Fender logo is not even an amateur fake. The Serial Number would have either been on the neck plate or at the top of the headstock, but not on the back of the neck. there should be some evidence of a pull/thumb bar (even if just the screw holes), it should weigh a ton, and even if it were real (which it clearly is not), even bad examples didn't have a neck joint like that. All of that said, if it were real, it should be worth about £2k