Historical clue formulations

• Keystone figure — 2022-04-15
• Keystone ___ (character in slapstick comedy) — 2021-05-19
• Keystone character — 2019-04-24
• Keystone enforcer — 2018-12-21
• "Keystone" character of old comedy — 2018-07-08
• Keystone figure — 2017-12-30
• Keystone officer — 2017-05-07
• Keystone ___ — 2016-09-27
• One of a silent force? — 2014-02-15
• Keystone ___ — 2007-12-16
• Silent lawman? — 2006-01-06
• Keystone ___ (old comedy figure) — 2005-09-26
• Silent authority? — 2004-12-12
• Keystone lawman — 2004-06-29
• Keystone officer — 2004-04-12
• Keystone ___ — 2004-01-21
• Keystone lawman — 2003-02-11
• Keystone fellow — 2002-01-09
• Keystone figure — 2001-07-12
• Keystone character — 2001-04-10
• Keystone figure — 2000-11-17
• Ford Sterling played one — 1998-05-03
• Keystone character — 1997-01-27
• "Keystone" character — 1995-12-21
• Film policeman — 1995-07-26
• Keystone figure — 1994-08-04
• Keystone officer — 1994-02-03
• Keystone fellow — 1994-01-05