Country that doesn't exist

Hey! Many years ago I got the following postcards from my mum (she found them in her things) but to be honest...I didn't appreciate them then. Lately, I realised that it's a precious treasure in my collection :D
The country I will show you postcards from is...Czechoslovakia! :) On 1st January 1993 it split into the Czech Republic and Slovakia.
The postcards show some typical places in both of those countries like Prague, Bratislava, Olomouc or Opava:

Greetings,
Karolina :)