Shosun Peacock Picture

Hello Everyone! First time posting in this category. I have this picture (wood block?) that is signed Shosun in pencil but mine appears to be an older piece than what is currently on the market. The picture itself measures 3 5/8" across and 5 1/2" tall. I think the acid in the paper has darkened it quite a bit. The frame is original but I replaced the back some years ago, probably because the original back was torn or missing and I wanted to try and keep it from being exposed to any additional acid. Does it have any value in this condition? Sorry about the shadows and the glare. I tried to keep them down as much as I could. Thanks for whatever guidance you can provide.
Don