I must admit that I have been sucked into the PSA Registry. I know that there are some people out there who prefer SGC graded cards to PSA graded cards.
That said I would like to trade player for player just converting my slab to PSA and trade you my SGC.
Interesting idea and I've never seen this on this site but if you prefer SGC trade me your PSA so I can build up my registry !!!
Cards with non common backs may be needing a little more to trade for or the same back of course would work.
List of SGC cards:
Abbaticchio, Ed--- Blue Sleeves--- Pittsburgh Pirates--- SC 350-460 Fac.30 SGC Poor SGC 10
Ames, Red ---Portrait--- New York Giants--- PD 350 Fac.25 SGC Poor SGC 10
Atz, Jake ---Portrait--- Chicago White Sox--- SC 350 Fac.30 SGC VG SGC 40
Baker, Home Run--- Follow Thru--- Philadelphia Athletics--- Polar Bear Fac.6 SGC Poor SGC 10
Barry, Jack ---Portrait--- Philadelphia Athletics--- PD 350 Fac.25 SGC Good + SGC 35
Bates, Johnny--- Batting--- Boston Braves--- PD 150 Fac.25 SGC VG SGC 30
Bender, Chief ---Trees--- Philadelphia Athletics--- PD 350 Fac.25 SGC Authentic SGC Authentic
Bender, Chief ---Portrait--- Philadelphia Athletics--- PD 150 Fac.25 SGC Fair SGC 20
Bergen, Bill ---Catching--- Brooklyn Superbas ---PD 350-460 Fac.25 SGC Fair SGC 20
Birmingham, Joe ---Horizontal--- Cleveland Naps ---PD 150 Fac.25 SGC VG SGC 40
Brashear, Roy ---Portrait--- Kansas City Blues--- PD 350 Fac.25 SGC VG SGC 40
Browne, George ---Batting--- Washington Senators--- SC 350 Fac.30 SGC Poor SGC 10
Brown, Mordecai ---Portrait--- Chicago Cubs--- PD 150 Fac.25 SGC Fair SGC 20
Burchell, Fred--- Ready to Throw--- Buffalo Bisons--- EPDG Fac.17 SGC Good SGC 30
Burns, Bill--- Ready to Throw--- Chicago White Sox ---SC 350 Fac.30 SGC Good SGC 30
Chance, Frank--- Red Portrait--- Chicago Cubs--- PD 150 Fac.25 SGC Poor SGC 10
Cicotte, Ed ---Follow Thru ---Boston Red Sox--- PD 150 Fac.25 SGC Fair SGC 20
Collins, Eddie--- Portrait--- Philadelphia Athletics--- Old Mill SGC Poor SGC 10
Dahlen, Bill ---Portrait--- Boston Braves--- PD 150 Fac.25 SGC Poor SGC 10
Davis, Harry--- Davis--- Philadelphia Athletics--- Sovereign 350 (Apple Green) Fac.25 SGC VG + SGC 45
Delvin, Art ---Portrait--- New York Giants ---PD 150 Fac.25 SGC Very Good SGC 40
Donlin, Mike ---Batting New York Giants--- PD 150 Fac.25 SGC Fair SGC 20
Donohue, Jiggs ---Follow Thru Chicago White Sox--- PD 350 Fac.25 SGC Good SGC 30
Dooin, Red--- Portrait Philadelphia Phillies--- SC 150 Fac.30 SGC Poor SGC 10
Dougherty, Patsy--- Arms in air Chicago White Sox--- SC 350 Fac.30 SGC VG SGC 40
Dougherty, Patsy--- Portrait Chicago White Sox--- PD 150 Fac.25 SGC Good SGC 30
Dubuc, Jean ---Ready to Throw Cincinnati Reds--- Old Mill SGC Good SGC 30
Dunn, Joe ---Standing Brooklyn Superbas--- SC 350 Fac.30 SGC VG SGC 40 TRADED 
Elberfeld, Kid--- Portrait--- New York Highlanders--- PD 150 Fac.25 SGC Good SGC 30
Evans, Steve--- Batting--- St. Louis Cardinals--- EPDG Fac.17 SGC Poor SGC 10
Flick, Elmer--- Batting--- Cleveland Naps--- PD 150 Fac.25 SGC Poor SGC 10
Griffith, Clark--- Batting--- Cincinnati Reds--- Polar Bear Fac.6 SGC Poor SGC 10
Herzog, Buck--- Sweater--- Boston Braves--- Polar Bear Fac.6 SGC Good + SGC 35
Hinchman, Harry--- Portrait ---Toledo Mud Hens--- PD 350 Fac.25 SGC Good SGC 30
Hoffman, Danny--- Follow Thru ---St. Louis Browns--- PD 350 Fac.25 SGC Fair SGC 20
Huggins, Miller ---Hands to mouth--- Cincinnati Reds--- PD 350 Fac.25 SGC Poor SGC 10
Jacklitsch, Jack ---Fielding ---Philadelphia Phillies--- SC 150 Fac.30 SGC Good SGC 30
Jennings, Hughie ---One Hand Showing--- Detroit Tigers--- SC 350-460 Fac.42 (Overprint) SGC Good SGC 30
Jennings, Hughie--- Portrait--- Detroit Tigers--- PD 150 Fac.25 SGC Fair SGC 20
Keeler, Willie ---Batting ---New York Highlanders--- PD 150 Fac.25 SGC Poor SGC 10
Kelley, Joe ---Batting--- Toronto Maple Leafs--- PD 350 Fac.25 SGC Poor SGC 10
Kling, Johnny--- Portrait ---Chicago Cubs--- SC 150 Fac.30 SGC Poor SGC 10
Lord, Harry ---Batting--- Boston Red Sox--- PD 350 Fac.25 SGC VG SGC 40
Magee, Sherwood--- Portrait--- Philadelphia Phillies--- PD 350 Fac.25 SGC A SGC Authentic
Marquard, Rube--- Portrait ---New York Giants--- PD 350 Fac.25 SGC Fair SGC 20
McAleese, John--- Ready to Throw--- St. Louis Browns--- PD 350 Fac.25 SGC Poor SGC 10
McGinnity, Joe ---Follow Thru ---Newark Indians--- PD 350 Fac.25 SGC Poor SGC 10
McGraw, John ---Finger in Air ---New York Giants--- PD 150 Fac.25 SGC Poor SGC 10
McIntyre, Matty ---Portrait ---Detroit Tigers--- PD 350 Fac.25 SGC Fair SGC 20
Milan, Clyde ---Batting ---Washington Senators--- SC 350 Fac.30 SGC Fair SGC 20
Miller, Dots ---Batting ---Pittsburgh Pirates--- SC 350 Fac.30 SGC VG SGC 30
Moran, Pat ---Seated ---Chicago Cubs ---PD 350 Fac.25 SGC Authentic SGC Authentic
Mullin, George--- Horizontal ---Detroit Tigers--- SC 150 Fac.25 SGC Fair SGC 20
Murray, Red---Batting--- New York Giants ---PD 350 Fac.25 SGC Poor SGC 10
Owen, Frank--- Follow Thru ---Chicago White Sox--- SC 150 Fac.649 (Overprint) SGC Fair SGC 20 TRADED
Pickering, Ollie--- Portrait--- Minneapolis Millers--- PD 350 Fac.25 SGC Authentic SGC Authentic
Powell, Jack--- Horizontal ---St. Louis Browns--- SC 350 Fac.25 SGC Fair SGC 20
Powers, Mike--- Catching--- Philadelphia Athletics ---PD 150 Fac.25 SGC VG-EX+ SGC 55
Purtell, Billy ---Fielding--- Chicago White Sox--- PD 350 Fac.25 SGC Poor SGC 10
Quinn, Jack--- Follow Thru ---New York Highlanders--- SC 350 Fac.30 SGC Good SGC 30
Raymond, Bugs--- Follow Thru ---New York Giants--- PD 350 Fac.25 SGC Good SGC 30
Reulbach, Ed--- Glove Showing--- Chicago Cubs--- PD 150 Fac.25 SGC Good SGC 30
Rhodes, Charlie ---Portrait ---St. Louis Cardinals--- Polar Bear Fac.6 SGC Poor SGC 10
Rucker, Nap--- Pitching--- Brooklyn Superbas ---PD 350 Fac.25 SGC Poor SGC 10
Schlei, Admiral--- Portrait--- New York Giants ---Sovereign 460 Fac.25 SGC Fair SGC 20
Schlei, Admiral ---Batting ---New York Giants--- SC 350-460 Fac.30 SGC Poor SGC 10
Schmidt, Boss ---Portrait ---Detroit Tigers ---SC 350 Fac.25 SGC VG SGC 40
Schmidt, Boss ---Pitching--- Detroit Tigers--- PD 350 Fac.25 SGC Fair SGC 20
Schreck, Ossee ---Portrait ---Columbus Senators--- SC 350 Fac.30 SGC Good SGC 30
Scott, Jim ---Follow Thru ---Chicago White Sox--- SC 350 Fac.30 SGC VG SGC 40
Seymour, Cy--- Pitching--- New York Giants--- SC 350-460 Fac.25 SGC VG SGC 40
Smith, Frank--- F. Smith--- Chicago White Sox--- PD 150 Fac.25 SGC Good SGC 30
Snodgrass, Fred--- Catching ---New York Giants--- SC 350 Fac.30 SGC VG SGC 40 TRADED
Steinfeldt, Harry--- Portrait--- Chicago Cubs--- PD 350 Fac.25 SGC Fair SGC 20
Street, Gabby ---Portrait ---Washington Senators--- Sovereign 350 (Forrest Green) SGC Poor SGC 10
Sullivan, Billy ---Portrait ---Chicago White Sox--- PD 150 Fac.25 SGC Fair SGC 20
Tannenhill, Jesse ---Ready to Throw ---Washington Senators--- PD 350 Fac.25 SGC Fair SGC 20
Tannenhill, Lee ---Tannehill ---Chicago White Sox--- Tolstoi Fac.30 SGC Poor SGC 10
Tenney, Fred ---Portrait ---New York Giants ---PD 150 Fac.25 SGC VG SGC 30
Thebo, Tony--- Fielding--- Waco Navigators (SL)--- PD 350 Fac.25 SGC Poor SGC 10
Waddell, Rube ---Portrait ---St. Louis Browns--- SC 150 Fac.30 SGC Poor SGC 10
Waddell, Rube ---Throwing--- St. Louis Browns--- PD 150 Fac.25 SGC Good SGC 30
Wagner, Heinie ---Bat Rt. Shoulder ---Boston Red Sox--- PD 350-460 Fac.25 SGC Fair SGC 20
Wallace, Bobby--- Portrait--- St. Louis Browns--- PD 150 Fac.25 SGC Poor SGC 10
Walsh, Ed ---Portrait--- Chicago White Sox--- SC 350 Fac.25 SGC Poor SGC 10
Weimer, Jake--- Portrait--- New York Giants--- SC 150 Fac.30 SGC Good SGC 30
Wheat, Zack--- Batting--- Brooklyn Superbas--- Polar Bear Fac.6 SGC Fair SGC 20
White, Doc ---Portrait--- Chicago White Sox--- PD 150 Fac.25 SGC Poor SGC 10
Wilhelm, Kaiser ---Ready to Pitch ---Brooklyn Superbas--- SC 150 Fac.649 (Overprint) SGC Good SGC 30
Willis, Vic ---Throwing ---St. Louis Cardinals ---PD 350 Fac.25 SGC Poor SGC 10
Zimmerman, Heinie ---Batting--- Chicago Cubs--- PD 350 Fac.25 SGC VG SGC 40