Collectors market index

Collectors market index is a tool used by collectors and investors to track values of collectibles against collectors market from a specific date, calculated in form of Index. It measures the value of a section of the collectors market and computed from the prices of selected collectibles, typically a weighted average.

COLECTY US Scripophily © Market Index is calculated for Scripophily U.S. market by COLECTY, includes worldwide transportation, government and other types of collectible stock and bonds.

...
Wikipedia