Inscription on cap: Ессентуки 20 5-8-1977
This was on the mineral water called "Essentuki #20". 5 and 7 feathers in wings.
© Image by
Inscription on cap: Ессентуки 1-8-90
The year is shown with just 2 digits. The separators are dots.
There are some caps without dots and hyphens in calendar.
© Image by Vyacheslav Morozov