To me they look like the kind of bass one might find at Toys R Us (as part of a package which includes a cheap amp and a cowboy hat).
You're not that far off. They were originally sold at Sears through the Silvertone line. That said, they're a significant improvement over anything you'll find in a toy store. I remember the Synsonics guitars from the 80s and 90s with the built in amp. Those were horrific.