Hi Ken, the ball you've got there is the 1926 model of the Ban Johnson baseballs. The box however is from a 1946 William Harridge ball. The ball you've got was only made 1 year so they are a bit harder to find, I would put the value of your ball based on condition and stamping between $250-$300 in an eBay auction. But you never know, if somebody really wants that year it could go up.
There is a similar ball to your's condition wise on the bay right now, a bit stronger stamping and an older model so I'd value it a little higher, it's at $305.00 right now, maybe it can give you better idea:
http://www.ebay.com/itm/290605436487...#ht_500wt_1413