An 1878 e pluribus unum silver dollar is typically worth between $15 and $20 in circulated condition. However, it is important to note that the actual value of your coin may vary depending on its condition and where you sell it. If you have an 1878 e pluribus unum silver dollar that is in uncirculated condition or if it has other unique features, it may be worth more. To determine the exact value of your coin, you can take it to a local coin dealer or appraiser for an evaluation.