Sinking Fund (France 1929)

Stamp Sinking Fund it reflects the thematic directions:

Finance is the study and discipline of money, currency and capital assets. It is related to but distinct from economics, which is the study of the production, distribution, and consumption of goods and services.Based on the scope of financial activities in financial systems, the discipline can be divided into personal, corporate, and public finance.

A scientist is a person who researches to advance knowledge in an area of the natural sciences

A chemist (from Greek chēm(ía) alchemy; replacing chymist from Medieval Latin alchemist)[1] is a graduated scientist trained in the study of chemistry, or an officially enrolled student in the relevant field. Chemists study the composition of matter and its properties. Chemists carefully describe the properties they study in terms of quantities, with detail on the level of molecules and their component atoms. Chemists carefully measure substance proportions, chemical reaction rates, and other chemical properties. In Commonwealth English, pharmacists are often called chemists.

A biologist is a scientist who conducts research in biology. Biologists are interested in studying life on Earth, whether it is an individual cell, a multicellular organism, or a community of interacting populations.They usually specialize in a particular branch (e.g., molecular biology, zoology, and evolutionary biology) of biology and have a specific research focus (e.g., studying malaria or cancer).