I have six of a set of seven of these cards. All are Mets players from 2003. They resemble the cards from the 2003 Fleer Tradition set except the diamonds on the front are orange (instead of yellow) and the borders on the back are blue (instead of green). I'm thinking that this was a set of cards either given out or sold exclusively at Shea Stadium.
The set includes Tom Glavine (#2 of 7), Floyd (#3), Al Leiter (#4), Jae Seo (#5), John Franco (#6) and Ty Wigginton (#7). I believe #1 was Mike Piazza. I at one point owned and lost a signed Mike Piazza card which I believe belonged to this set.