The current True Market Value of a coin is determined by several factors:

Mintage

A Coin’s total possible supply available to a market is determined by its mintage= the combined quantity of a particular coin produced by a mint (an industrial facility which manufactures coins for currency). A mintage is typically annual hence, once a year is over the supply of that coin is capped.

Melt Value

Refers to the intrinsic value of a coin composed of a precious metal if melted and sold at current market mark.

Grade/Condition

The physical condition of a coin is graded for imperfections. Uncirculated coins and those in Mint condition are rare and hold greater values.

Supply/Dealer Stock

The number of existing coins for a given type, denomination, date and mint

Demand

Current market demand for a particular coin and/or mintage.