USSR, 25 October, 1988 (Zagorsky 5934)
The Nuclear-powered icebreaker Sibir
on a high-latitude expedition. This stamp is great because it's got people doing science, a boat, a helicopter, a map with route, and plenty of ice.
The ship was the 2nd such-named Soviet icebreaker, in service from 1977 to 1992.
A new Sibir
is scheduled to enter service in 2020. Here it is under construction.
Interestingly, the first Sibir
(1938-1973) was first named I. Stalin
but that changed shortly after the death of Stalin, the same fate as pretty much anything named after the not-so-dearly beloved Papa Joe.
USSR, 1940 (Zagorsky 636)