Number group Earliest date known Front design Designator ------------------------------------------------------------------------------------ 45,000,001 April 2007 Handy Hints T-c1 to T-c4 to 45,100,000 45,100,001 May 2007 Handy Hints T-c1 to T-c4 to and T-b1 to T-b4 45,200,000 45,200,001 May 2007 Handy Hints T-b1 to T-b4 to 45,300,000 45,300,001 July 2007 Handy Hints T-b1 to T-b4 to 45,400,000 45,400,001 July 2007 ? Handy Hints T-a1 to T-a4 to 45,500,000 45,500,001 July 2007 ? Handy Hints T-a1 to T-a4 to 45,600,000 45,600,001 June 2007 Handy Hints T-a1 to T-a4 to and T-d1 to T-d4 45,700,000 45,700,001 July 2007 ? Handy Hints T-d1 to T-d4 to 45,800,000 45,800,001 June 2007 Handy Hints T-d1 to T-d4 to 45,900,000 45,900,001 February 2008 Handy Hints T-c1 to T-c4 to 46,000,000