Buyer - Old Coins And Notes

The total mintage (how many were originally made) and the current "surviving population" are primary value drivers.

A critical part of any research paper on this topic is the legal landscape, which varies by country: Is It Legal To Own Ancient Coins? - GOVMINT old coins and notes buyer

The value of old currency is not fixed and is determined by several core factors that any buyer or seller must understand: The total mintage (how many were originally made)