Purchasing Sacagawea dollars in mint condition should be your goal, since the state of a coin is really important to its worth as a collectible. A damaged coin is much less attractive to a buyer than one which is without blemishes, which can command a substantial premium. It is also important to realize that value is not determined by age alone. As a general rule, the older and rarer a coin is, the more valuable it will be; but did you know that other situational factors play a role, too?. Demand is a key factor in the market value of any collectible coin.