Jaskółka-class minesweeper
The Jaskółka class was a class of six minesweepers of the Polish Navy built during the 1930s. They were the first sea-going warships of Polish production. The Jaskółka class was a versatile design which allowed the ships to serve in the role of either a minesweeper, small minelayer or a sub chaser. All were named after birds, therefore the class was nicknamed: ptaszki.