How much is an original autographed picture of Johnny Cash and June Carter worth?

My grandma gave me her autographed picture of Johnny Cash and June Carter. It is probably from the early 70's right after they got married because she signed it "June Carter Cash".
I have looked on Ebay but I couldn't find one with both of their autographs on it.
The Picture is black and white and is in pretty good shape.
I am not planning on selling it. I would just like to know how much it is worth.

i'd say if you get a person really interested in them it would go for big! and i mean big but if u were to put it on ebay make sure its a high starting bid or buy it now price

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