Enter this item's GTIN number, if available. A GTIN is a unique product identifier for trade items. It will recognize several standard product identifiers, including ISBN, UPC, EAN and JAN numbers. Products like hand-made jewelry and antiques will probably not have a GTIN number, but if this item does have one (e.g. recent books),
it will be to your advantage to enter it here, since it will help search engines find this product more readily.