There was a spread sheet floating around at the fender forum years ago where a guy had been recording Fender bass weights for 70s Fenders and had quite a sample. The average weight until around 77 or so was less than 10 pounds with a few outliers. After 77 they tended to get heavier but still averaged around 10 pounds with some outliers. This 70s Fender weight business has been retold so many times that common folklore has them all weighing 11 plus pounds now and that's just not the case. My 76 Jazz weighs nine pounds and so does my 74 Precision, btw.
Id have to go through the list of stuff ive owned,but I have had at least 15 70s Fenders none reached 12 pounds or more, I actually think the heaviest was like 11.5, most 70s Fenders I had were 76+ models, besides 2.