I can give you only the observation and advice given on the other thread about this: It is a faded print or reproduction. You need to take it out of the frame and look for publishing and other information, if you believe knowing that will increase its value or saleability, despite its condition.
Its value is going to depend much upon just it is; that is, what kind of print or reproduction, as well.
Look at it through a good magnifying glass or with a loupe. Do you see dots? If it's a traditional, non-mechanical, lithograph, you'll see a sort of stippled pattern all over but any dots are rather small, vary somewhat in size, are in no set pattern. If the dots are uniform in size and in a regular pattern, it's a mechanical offset lithograph, a mass-produced reproduction.
If you don't see dots with the loupe, what do you see?
Previous thread:
https://community.ebay.com/t5/Collectibles-Art/help-with-art-work/td-p/33075478
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