Yeah. I got the 6690B's several years ago. Maybe more than 5 years ago. Their dated 1974 if I remember correctly. I got the 6660's maybe 2 years ago. They're 80's units. I'm thinking about taking them out of the boxes and sealing them in plastic bags so they take up less space.
Yeah they could be. But I plan on using them in the future. I would maybe keep one or two of the best looking ones in their boxes. Most of the boxes are falling apart because the glue or whatever was used to seal them I guess has dried out.