Dating a Fender Humbucker Pickup

Last fall I picked up a White (now practically yellow) 1973 Fender MusicMaster Bass at a little country auction. This is not something I would play very often and was mainly into it for collecting or flipping. What was interesting about this particular bass was the home modification the original owner had done. This was equipped with an original Telecaster Bass Humbucker. The type Seth Lover had designed after being lured over from Gibson in 1968. The mod itself was not bad, but not nice enough for me to dream that it could have possibly been a factory custom order. The pickup is probably worth more than the bass, having seen one recently on Gbase for about $500.

Does anybody know how to date these pickups ? There is a 4 digit stamp on the back of the pickup's metal rear housing plate (3375), the 75 making perfectly good sense but I just don't know. While I am familiar with Fender neck stamps and dating pots, I don't have any experience with this pickup. It also has me wondering if this was ripped from a Telecaster Bass or purchased from Fender. Could you buy pickups and other electronic parts like this from Fender in the 70s? The scavenging from the Tele Bass makes less sense, considering that would have been a fairly new Bass at the time of the mod. Plus the Tele would have been a much more desirable instrument. If you know about any of this, please chime in. Thanks.

 

Since this topic is more-so about dates/basses than electronics, I should likely post this in a different section of the forum. If a moderator wants to delete this from here, NP ...... sorry for posting in what is probably the wrong section.