Number group Earliest date known Front design Designator ------------------------------------------------------------------------------------ 42,000,001 March 2007 Handy Hints T-b1 to T-b4 to 42,100,000 42,100,001 July 2007 ? Handy Hints T-b1 to T-b4 to 42,200,000 42,200,001 March 2007 Handy Hints T-b1 to T-b4 to and T-c1 to T-c4 42,300,000 42,300,001 March 2007 Handy Hints T-c1 to T-c4 to 42,400,000 42,400,001 March 2007 Handy Hints T-c1 to T-c4 to 42,500,000 42,500,001 February 2007 Handy Hints T-c1 to T-c4 to 42,600,000 42,600,001 March 2007 Handy Hints T-c1 to T-c4 to 42,700,000 42,700,001 March 2007 Handy Hints T-c1 to T-c4 to 42,800,000 42,800,001 March 2007 Handy Hints T-c1 to T-c4 to 42,900,000 42,900,001 March 2007 Handy Hints T-c1 to T-c4 to and T-d1 to T-d4 43,000,000