40th Anniv. of Great October Revolution - Estonian SSR (Soviet Union, USSR 1957)

Stamp 40th Anniv. of Great October Revolution - Estonian SSR it reflects the thematic directions:

A sea is a large body of salty water. There are particular seas and the sea. The sea commonly refers to the World Ocean, the wider body of seawater. Particular seas are either marginal seas, second-order sections of the oceanic sea (e.g. the Mediterranean Sea), or certain large, nearly landlocked bodies of water.

A coat of arms is an heraldic visual design on an escutcheon (i.e. shield), surcoat, or tabard. The coat of arms on an escutcheon forms the central element of the full heraldic achievement which in its whole consists of shield, supporters, crest, and motto. A coat of arms is traditionally unique to an individual person, family (except in the United Kingdom), state, organisation or corporation.

In the visual arts, a cityscape (urban landscape) is an artistic representation, such as a painting, drawing, print or photograph, of the physical aspects of a city or urban area. It is the urban equivalent of a landscape. Townscape is roughly synonymous with cityscape, though it implies the same difference in urban size and density (and even modernity) implicit in the difference between the words city and town. In urban design the terms refer to the configuration of built forms and interstitial space. 

In clothing, a suit is a set of garments made from the same cloth, usually consisting of at least a jacket and trousers. Lounge suits (also known as business suits when sober in colour and style), which originated in Britain as country wear, are the most common style of Western suit. Other types of suit still worn today are the dinner suit, part of black tie, which arose as a lounging alternative to dress coats in much the same way as the day lounge suit came to replace frock coats and morning coats; and, rarely worn today, the morning suit. This article discusses the lounge suit (including business suits), elements of informal dress code.

An anniversary is the date on which an event took place or an institution was founded in a previous year, and may also refer to the commemoration or celebration of that event. For example, the first event is the initial occurrence or, if planned, the inaugural of the event. One year later would be the first anniversary of that event. The word was first used for Catholic feasts to commemorate saints. Most countries celebrate national anniversaries, typically called national days. These could be the date of independence of the nation or the adoption of a new constitution or form of government. The important dates in a sitting monarch's reign may also be commemorated, an event often referred to as a "Jubilee".