Alexander Cartwright
(b. April 17, 1820 - d. July 12, 1892)
On September 23, 1845, Alexander Cartwright formed the Knickerbocker Base Ball Club and formalized a set of 20 rules that gave baseball its basic shape. While Cartwright's involvement with the game lasted only a few years, he is the man most responsible for the game that is played, and loved, today. Our national pastime is his legacy.
 
Inducted in 1938
 
 
1950 Callahan Alexander Cartwright PSA 9 MINT
     
Click Image to Zoom
Click Image to Zoom
 

Comments: I purchased this one in September, 2004 on eBay from Andrew Tuttle (consignmints). I have a bunch of Callahans and might swap this out for a different issue at some point. Eventually, I'd like to replace the item with a cabinet card contemporary to Cartwright's career but the opportunities are few, with less than a handful of items in existence belonging to high-profile collectors.

UPDATE: After many months of eyeballing a PSA 9 on eBay and watching the price be consistently lowered, I finally pulled the trigger at $56 in June, 2016.  I went to the 4 Sharp Corners website and leveraged the 10% off deal for the week and picked up a ½ bump upgrade.  I figured the price was ok and wanted something I could register with PSA.  Hopefully, I can sell the SGC 92 example to recoup some of the cost.
   
Card Details Below:  
Year(s): 1950
ACC Set Designation:
Set Name: Callahan
Country: United States
Description: These cards which feature artist Mario DeMarco's drawings of Hall of Famers, were produced from 1950 through 1956 and sold by the Baseball Hall of Fame in Cooperstown and at major league ballparks. The cards measure 1-3/4" X 2-1/2" and include a detailed player biography on the back. When introduced in 1950 the set included all members of the Hall of Fame up to that time, and then new cards were added each year as more players were elected. Therefore, cards of players appearing in all previous editions are more common than those players who appeared in just one or two years. When the set was discontinued in 1956 it consisted of 82 cards, which is now a complete set. B.E. Callahan of Chicago, the publisher of "Who's Who in Baseball," produced the card set.
 
Example 1950 Callahan Box
Example 1950 Callahan Box