Number group Earliest date known Front design Designator ------------------------------------------------------------------------------------ 44,000,001 July 2007 ? Handy Hints T-c1 to T-c4 to 44,100,000 44,100,001 November 2007 Handy Hints T-b1 to T-b4 to 44,200,000 44,200,001 November 2007 ? Handy Hints T-b1 to T-b4 to 44,300,000 44,300,001 November 2007 Handy Hints T-b1 to T-b4 to 44,400,000 44,400,001 June 2007 Handy Hints T-b1 to T-b4 to and T-a1 to T-a4 44,500,000 44,500,001 April 2007 Handy Hints T-a1 to T-a4 to 44,600,000 44,600,001 April 2007 Handy Hints T-a1 to T-a4 to 44,700,000 44,700,001 April 2007 Handy Hints T-d1 to T-d4 to 44,800,000 44,800,001 April 2007 Handy Hints T-d1 to T-d4 to 44,900,000 44,900,001 April 2007 Handy Hints T-c1 to T-c4 to 45,000,000