Historical clue formulations

• Polish city by the sea — 2024-01-23
• Polish seaport — 2018-04-24
• Polish part — 2005-07-24
• Port on the Vistula — 2004-05-22
• City where Lech Walesa rose to prominence — 2003-11-04
• Solidarity's birthplace — 1999-12-19