For signed balls, values can be all over the place. The quality of the ball and signatures matter a lot, and the highest prices are going to be had for white balls and sharp crisp signatures.
Best to do your own research or just call or email one of the big auction houses, they can give you the best estimates.
Google "1956 Yankee Signed Baseball" should get you enough information to make an informed opinion.
Your ball is yellowed, but the signatures are bold enough. Yours also has Mantle and Berra together which I would say is a plus. Past auction prices range from $900-3500. I'd put yours in the $2000-2500 range but at auction could go higher or lower.
PS. It's not considered good form to start a new thread on a top for which you already posted.
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