Definitely a 77, and I'd agree that it has been refinished, the clear coat isn't tinted enough to be original unless it sat in a closet for the last 30 years and even then it should be a little more yellow than that. The strap buttons are wrong, they should be more Y shaped, while these are more T shaped. As said above, check under the pickguard, there should be a serial number sticker on the back that matches the headstock number so you'll know if the guard is original (not that that's really important).
I think the Jazz Bass part of the decal looks ok. They shrank in the late 70s, but it might be aligned slightly different than mine. It might be the angle of the pics, but mine looks to reach a little closer to the curve of the headstock.
Here is a pic of my 78 for comparison:
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