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			The Pet and Kopec sets were split into two by Burdick, before the 'error' here was corrected and the sets united into one.
 They were almost certainly printed by the same printer who did T212 Obak.  It is probably a late 1911 or 1912 issue, based on the events mentioned on card reverses.
 
 A significant number of cards seem to have purple stamps on the back.
 
 I think there are 40 cards with no short prints (some seem less available because they are more popular and sitting in collections).  It appears all cards have both Pet and Kopec backs, but I have not confirmed them all or kept scans.  Hopefully the formatting is preserved, but here is what I have as the checklist.
 
 1	Walter Brookins		Aviator
 2	Glenn Curtiss			Aviator
 3	Hubert Latham		Aviator
 4	P.O. Parmalee		Aviator
 5	James Radley			Aviator
 6	J.J. Ward	 Aviator
 7	Chas. F. Willard		Aviator
 8	Abe Attell			 Boxe
 9	Monte Attell			Boxer
 10	Frankie Burns			Boxer
 11	Tommy Burns			Boxer
 12	Eddie Campi			Boxer
 13	Joe Choynski			Boxer
 14	James J. Corbett		Boxer
 15	Jem Driscoll			Boxer
 16	Robert Fitzsimmons	Boxer
 17	Jim Flynn			 Boxer
 18	Johnny Frayne		Boxer
 19	Eddie Hanlon			Boxer
 20	Dick Hyland			Boxer
 21	James J. Jeffries		Boxer
 22	Jack Johnson			Boxer
 23	Al Kaufman			Boxer
 24	Hugo Kelly			Boxer
 25	Johnny McCarthy		Boxer
 26	Owen Moran			Boxer
 27	Battling Nelson		Boxer
 28	Billy Papke			Boxer
 29    John L. Sullivan		Boxer
 30	Joe Thomas			Boxer
 31	Ad. Wolgast			Boxer
 32	Harry A. Gibson		Cyclist
 33	Harley Davidson		Roller Skater
 34	George Bond			Swimmer
 35	J. Scott Leary			Swimmer
 36	W.R. McWood			Swimmer
 37	Johnny Hayes			Track & Field
 38	Soldier King			Track & Field
 39	Tom Longboat			Track & Field
 40	Frank Gotch			Wrestler
 
			
			
			
			
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