The KC and KV forms are apparently associated with the change to Crafted in Korea.
Squier II's could not possibly have been assembled before 1987/88, as these represent the transition to Indian and then Korean production, and all the ramifications of such (the serial numbers can be off by years for these particular axes, and neck dates may also be misleading). This form is associated with Made in China Affinitys (with the standard body thickness of 45mm/1.75). These forms are apparently associated with the change to Crafted in China, so post-1996 models only would have this form of serial number. YN is associated with 'made in china' rather than 'crafted in china' and 1996 was the year they swapped to 'crafted in china' and mostly CY prefixes.
Squier Classic Vibe series guitars/basses serial numbers start with CG.
No matter what you think of Ovation guitars, you have to hand it to them for trying, and I mean trying hard.
That it was/is exceptionally, well, homely with its lumpy potato shape certainly added to the mystique!
Actually, there’s so much going on with this bass it’s mind boggling.