Steps to Take Before Purchasing

• Read the description thoroughly - make sure the autograph isn't described as a reprint, preprint, copy, facsimile, stamp or autopen.
• Do some research - it helps to know about the company you are buying from.  If possible buy from a reputable company and make sure to have an up close picture of the signature.
• Look for memorabilia that has been examined and declared authentic by a third-party expert. Authenticated items will have a Certificate of Authentication (COA).
• Recognized sports memorabilia authenticators include: PSA/DNA Authentication Services and Global Authentication Inc.
• Ask questions - don't hesitate to ask any questions you might have.  If they are an honest seller they won't have anything to hide. Does the seller have a picture of the person signing the object?
• Educate yourself on prices - know what an item is worth before you buy. Avoid "too good to be true" deals that could be bogus.

Guides to Purchasing Certain Items

• Trading cards: Examine trading cards for sharp corners, smooth surfaces, and good centering. Since 1990, athlete-signed cards have often been inserted into new packs. Check the back of the card for certification.
• Balls: Look for autographed balls signed by a single player, which are worth more than balls signed by multiple players.
• Bats: Bats are among the easiest sports items to authenticate.  For higher value, look for game-used bats along with solid evidence of game wear and tear.
• Jerseys: If you're looking genuine game jerseys, watch for sweat stains, authentic wear and tear, and proof of game use. Research jersey labels to help determine authenticity.
• Photographs: Most photographs are 8 inches x 10 inches or smaller; larger sizes tend to be uncommon and accumulate value over time. Demand is also higher for color photos and photos signed before 1980.