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RhysSchoolboy Rowe is a fairly tough signature, but not really tough. Death dates are good indicaters of value but only offer a rough idea. I have seen Rowe autographs change hands fairly cheap on 3X5 cards etc, in the $50 range. Baseballs are a whole other arena and actually are very similar to cards. If you had a ball that was in lower shape with a personalized signature and a non-official ball, I could see a single signed Rowe sell for $100-$300. If the ball was near mint and official with a beautiful signature across the sweet spot, you could be looking at $1000-$2000 in an auction house.
There has been a person trying to sell a Rowe signed baseball on ebay for about a month now if you want to look at it. Not a single, and not the best of shape, but he has tried several times at $500 with no takers.
Hope that helps some.
Rhys
http://cgi.ebay.com/1930s-Vintage-Autographed-Baseball-Schoolboy-Rowe_W0QQitemZ8769937966QQcategoryZ27260QQssPageNa meZWDVWQQrdZ1QQcmdZViewItem