Yes, baseballs were commonly signed by Mickey Mantle and the entire Yankees team throughout Mantle's playing career. However, facsimile team-signed baseballs (with the signatures "stamped" on the ball) were and still are commonly sold.
It can sometimes be difficult to tell the difference between a vintage stamped ball and one that is actually autographed. Considering that a real signed 61 Yankees ball is worth more than $1,000 and a stamped ball is worth about $75, it's important to always do your homework on the item and the seller.
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