People who know Martin ribless guns aren't running around in bunches. Fewer still are actively seeking one out. Most are quite light, but, it is an odd sort of light, with a strange bias toward the action/buttstock. They come to life in 20 gauge, provided some idiot hasn't put a pad on it.
You will have the only one on your block. It will be hard to sell.
Been there, done that.
Best,
Ted