Historical clue formulations

• Ideal, informally — 2022-01-13
• Ideal, in teenspeak — 2018-08-25
• Philatelist's abbr. — 2014-05-23
• Philatelist's concern, briefly — 2013-08-10
• Stamp feature, in philately lingo — 2013-03-16
• B'way showing — 2008-09-01
• B'way showing — 2006-07-16
• Stamp feature, to a philatelist — 2001-09-22
• B'way showing — 1997-06-12
• Like most postage stamps: Abbr. — 1996-08-05
• Broadway showing, for short — 1993-11-27