Number group		Earliest known date	Front design		Designator
	
        ------------------------------------------------------------------------------------

	57,000,001		December 2007		Bus - Handy Hints	T-d1 to T-d4
	    to 
	57,100,000

	57,100,001		January 2008		Bus - Handy Hints	T-d1 to T-d4
	    to									and T-a1 to T-a4
	57,200,000

	57,200,001		January 2008		Bus - Handy Hints	T-a1 to T-a4
	    to									
	57,300,000

	57,300,001		February 2008		Bus - Handy Hints	T-a1 to T-a4
	    to 
	57,400,000

	57,400,001		December 2007		Bus - Handy Hints	T-a1 to T-a4
	    to									and T-b1 to T-b4
	57,500,000

	57,500,001		January 2008		Bus - Handy Hints	T-b1 to T-b4
	   to									
	57,600,000

	57,600,001		January 2008		Bus - Handy Hints	T-b1 to T-b4
	   to 
	57,700,000
	
	57,700,001		May 2008		Bus - Handy Hints	T-a1 to T-a4
	    to									
	57,800,000
	
	57,800,001		May 2008		Bus - Handy Hints	T-a1 to T-a4
	    to 
	57,900,000
	
	57,900,001		June 2008		Bus - Handy Hints	T-a1 to T-a4
	    to									
	58,000,000