Inscription on cap: Ессентуки 1-4-1983
The font differs from RU600301-1001, particularly in in the letter "У". First "Е" capitalized. The separators are dots.
© Image by Yuri Belousov
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