Historical clue formulations

• C. S. Lewis piece? — 2017-07-29
• Bit of product personalization — 2015-05-09
• *PO — 2015-02-03
• J, F or K — 2013-07-05
• Handkerchief embroidery — 2013-07-03
• O.K., maybe — 2007-01-27
• Sign off on — 2006-04-14
• O.K., in a way — 2002-01-20
• OK, in a way — 2000-06-23
• Approve, in a way — 1997-05-31
• Beginning — 1996-03-26
• First — 1995-04-08