'70s P-Bass serial number and stamp on neck heel

What tuners does it have? You can't really date with the neckplate, since they were for grabs in a big bin, and workers took them "at random" when they were assembling an instrument. I've seen L-serials as late as 1966, and pre-L serials as late as '63. Dating can be done via the potmeter codes (137 XXYY (XX=week, YY=year)) and the date on the pickups. 390000 is fairly high in the 300000 range, is entirely possible that the neckplate is original to the bass, and it is a 1975 instrument.

 

Ah, there is an open routing between the pickupcavity & the controlcavity, that's also from 1974 and later, so... Safe to say the body is a '75. Tuners are the ones used between 1968 & 1975, so that's also correct.

 

yes, and yes. I shouldn't worry too much about it.

 

This is not relevant but I will state it anyway. I bought a used bass and used amp in the early 80s for $200 and $200 for the amp. The amp was an Acoustic with a 2x15 cab. The bass was a blonde tele. This was from a local music store and this bass and amp really had no nostalgic value then. I bought it because I needed a bass, it was cheap, and, it worked. Never really gigged with it though and kept moving it around through life.
A few years ago I began getting back into music and still did not like the tele. I did notice it seemed to have more value than when I purchased it. I eventually traded it in something newer that was better.
The irony is that when I sold it the buyers (known experts, ha ha) disassembled it. They were convinced it was a 73 but of course they were incorrect. It was likely assembled in early 73.
They recently marketed it as a 72 Imagine that. Btw, that bass was way over rated. The bass was not versatile and the neck was the size of a 2x4. Still would not be worth $200 to me.

 

Cool bass! If the pickup is original check the pickup bottom for date, the last two numbers indicate year.