Number group Earliest date known Front design Designator ------------------------------------------------------------------------------------ 41,000,001 March 2007 Handy Hints T-a1 to T-a4 to 41,100,000 41,100,001 March 2007 Handy Hints T-a1 to T-a4 to 41,200,000 41,200,001 March 2007 Handy Hints T-a1 to T-a4 to 41,300,000 41,300,001 March 2007 Handy Hints T-a1 to T-a4 to 41,400,000 41,400,001 July 2007 Handy Hints T-a1 to T-a4 to 41,500,000 41,500,001 March 2007 Handy Hints T-b1 to T-b4 to 41,600,000 41,600,001 March 2007 Handy Hints T-b1 to T-b4 to 41,700,000 41,700,001 March 2007 Handy Hints T-b1 to T-b4 to 41,800,000 41,800,001 not yet seen to 41,900,000 41,900,001 March 2007 Handy Hints T-b1 to T-b4 to 41,000,000