Number group Earliest date known Front design Designator ------------------------------------------------------------------------------------ 39,000,001 August 2006 Handy Hints (Bus) T-b1 to T-b4 to 39,100,000 39,100,001 June 2006 Handy Hints (Bus) T-c1 to T-c4 to 39,200,000 39,200,001 June 2006 Handy Hints (Bus) T-c1 to T-c4 to 39,300,000 39,300,001 July 2006 Handy Hints (Bus) T-c1 to T-c4 to 39,400,000 39,400,001 June 2006 Handy Hints (Bus) T-c1 to T-c4 and to T-d1 to T-d4 39,500,000 39,500,001 June 2006 Handy Hints (Bus) T-d1 to T-d4 to 39,600,000 39,600,001 June 2006 Handy Hints (Bus) T-d1 to T-d4 to 39,700,000 39,700,001 December 2006 Handy Hints (Bus) T-a1 to T-a4 to 39,800,000 39,800,001 March 2007 Handy Hints (Bus) T-a1 to T-a4 to 39,900,000 39,900,001 October 2006 Handy Hints (Bus) T-a1 to T-a4 and to T-b1 to T-b4 40,000,000