This attractive se-tenant pair commemorates the 50th anniversary of the successful navigation of the Northern Sea Route. The left stamp depicts early Arctic icebreakers Taimyr and Vaigach, while the right stamp shows the nuclear-powered icebreaker Lenin escorting vessels through the Vilkitsky Strait. The design highlights Soviet Arctic exploration achievements and technological advancement in polar navigation. Se-tenant pairs from this issue are especially desirable when preserved intact with clean perforations and original gum. A notable thematic item for collectors specializing in polar exploration, maritime history, or Cold War technological achievements.