Those are not k-24 woofers, they are k-22 as shown in your picture. As 001 said, the woofers have alnico magnets - they're wonderful sounding woofers.
Your speakers are missing their labels from the back, but since the backs and motorboards are not painted black, they're most likely made from birch plywood (someone stained them at some point as they would have left the factory raw). The question is whether they are Decorator models or not. Some better pics of the tops and the front corner edges would help confirm.