Autographed helmets, especially those carrying a team logo, are of great interest to collectors. If the helmet has game experience, the interest is even greater. Do not try to repaint or repair the helmet if it is damaged – these only add to its value.
Baseball bats that are autographed can be of great interest depending on whose bat it is, and if it was used in a game. Bats that are unbroken carry greater interest than broken. Protective sleeves are available to keep the wood from deteriorating over time.
Autographed balls, no matter the sport, vary in price. Balls used in games garner the greatest interest, while balls designed for autographing are a little less in demand. The greatest significance is generated by whose autograph(s) is on the ball. Find a ball protector to keep it in good condition.