Mooncrest, it's nice that you have an old headset, and as you have not offered it for sale, your post is okay (we don't do ads here). If want to part with it, and you know of a young pilot who's just starting out, why not offer it to them as a nice gesture. It would not have much value for sale, as there are lots of new and good used headsets for sale. The microphone on that headset, though probably still works, would be considered lower quality for today's radios, and likely not replaceable.
As this is a headset topic, I'll move this post to the headset sticky.
Pilot DAR