https://www.dropbox.com/sh/c3dznkeu0g438fr/AADSuyHs4cSEQsAlCRqYQ4-La?dl=0
Here is an odd ball for you. I believe it to be a 1974 head case and chassis, with a slightly older 2203 circuit thrown in. But I don't know enough about PCB and component differences to date the insides. I do know that I haven't heard of a 1974 2203, since they came out in '75. It has two inputs, but says Super Lead on the back. What is it?