So if you have Fender with a neck date of 1964 and the pots are dated 1965, then you have a 1965 Fender Bass.There are some years in particular that can get real tricky.
The general rule of thumb is that a bass is as old as it's newest part, or at least it's latest dated part.
While there have been periods of dramatic change—such as the transition periods between the Leo Fender years and the CBS years or the transition between the CBS years and the current ownership—most models are generally feature-specific and do not change from year to year.
SERIAL NUMBERS are also helpful in determining an instrument’s production year.
Jerome Bonaparte Squier, a young English immigrant who arrived in Battle Creek, Michigan, in the latter part of the 19th century, was a farmer and shoemaker who had learned the fine European art of violin making. Victor Squier started making his own hand-wound violin strings, and the business grew so quickly that he and his employees improvised a dramatic production increase by converting a treadle sewing machine into a string winder capable of producing 1,000 uniformly high-quality strings per day.
He moved to Boston in 1881, where he built and repaired violins with his son, Victor Carroll Squier. Squier violin strings, banjo strings and guitar strings became well known nationwide and were especially popular among students because of their reasonable price. Squier Company in early 1965, shortly before Fender itself was acquired by CBS in May of the same year.