Every bass that old is effectively a piece unique, given how each instrument ages, degree of originality, structural and electronics integrity, etc.. So, it's hard to evaluate one vintage object's value relative to another's without the advantage of experience and personal inspection.
With that said, as an aggressive buyer of semi-modern and vintage Precision basses, I have observed softening selling prices and dwindling buyers. I always make it a point to look and see how many people are looking in the TB basses for sale area when I log on. Lately, there is seldom more than 110 or so viewers whereas as recently as a couple of months ago the number was regularly 200-250. Maybe it's just the summer doldrums, but the market is a buyer's market for sure.