This auction is for a Vintage Arizona Diamondbacks 07 Circle K Opening Day MLB Pin! This was a limited edition Stadium Giveaway Pin to the 1st 5000 fans on April 9, 2007! New. Still Sealed. Collect the entire Opening Day Pin Set from 1998-2012! Please email me with any questions. D-backs legends include: Luis Gonzalez, Mark Grace, Didi Gregorius, Patrick Corbin, Curt Schilling, Randy Johnson, Brandon Webb, Mark Reynolds, Stephen Drew, Justin Upton and Dan Haren! Thank you and enjoy this 4/9/07 AZ D-Backs Opening Day Lapel Pin!