In order for me to properly assess what you have I will need to know the size and see an image back (do not remove from frame) as well as a clear, in-focus close-ups of areas of the picture surface so I can see the texture and one of the signature.
If you had already attached images to your initial posting, they are not showing for me here on my end.
Please send the photos at your convenience. There is not an extra charge to provide more pictures here.
Great, thanks! You can send images at your convenience. No rush - there is not a time limit here.