Number group Earliest date known Front design Designator -------------------------------------------------------------------------------- 37,000,000 February 2007 Handy Hints T-b1 to T-b4 to 37,100,000 37,100,000 February 2007 Handy Hints T-b1 to T-b4 to 37,200,000 37,200,000 February 2007 Handy Hints T-b1 to T-b4 to 37,240,000 ? 37,240,000 ? January 2007 Handy Hints T-a1 to T-a4 to 37,300,000 37,300,000 February 2007 Handy Hints T-a1 to T-a4 to 37,400,000 37,400,000 February 2007 Handy Hints T-a1 to T-a4 to 37,500,000 37,500,000 February 2007 Handy Hints T-a1 to T-a4 to 37,600,000 37,600,000 February 2007 Handy Hints T-a1 to T-a4 to 37,700,000 37,700,000 February 2007 Handy Hints T-a1 to T-a4 to 37,740,000 ? 37,740,000 ? March 2007 Handy Hints T-d1 to T-d4 to 37,800,000 37,800,000 February 2007 Handy Hints T-d1 to T-d4 to 37,900,000 37,900,000 February 2007 Handy Hints T-d1 to T-d4 to 38,000,000