David Dahl Autographed/Signed Colorado Rockies Ticket Stub MLB Debut JSA 16877 This is a ticket stub from the Colorado Rockies vs Baltimore Orioles July 25, 2016 game, David Dahl's Major League Baseball Debut, in which was personally autographed by David Dahl. This includes a certificate of authenticity from James Spence Authentication JSAand Denver Autographs.