Lenny Dykstra Signed New York Mets Replica Souvenir Batting Helmet. This item comes fully certified with a certificate of authenticity from an approved SportsMemorabilia vendor and is backed by the SportsMemorabilia authenticity guarantee. . If a product is unsigned or non game-used, a hologram will not be included. Lenny Dykstra memorabilia. New York Mets memorabilia.