The average appreciation of numismatic coins can vary significantly based on various factors. It's important to understand that while some numismatic coins can appreciate in value over time, there are no fixed or guaranteed rates of return. Here are some factors that influence the appreciation of numismatic coins:

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1. Rarity: Coins that are rare or have limited mintage are more likely to appreciate in value because they are in higher demand among collectors.

2. Historical Significance: Coins with historical importance or those associated with significant events or figures tend to have better appreciation potential.

3. Condition (Grade): The condition of a coin, as graded by a professional coin grading service, significantly impacts its value. Coins in excellent condition often appreciate more.

4. Market Demand: Market trends and collector demand play a crucial role. Coins that are currently popular or in high demand are more likely to appreciate.

5. Metal Content: For coins made of precious metals like gold and silver, the price of the underlying metal is a significant factor in their value. Economic conditions and metal prices can influence appreciation.

6. Numismatic Trends: The numismatic market can change over time, and some coins may go in and out of favor with collectors. Staying informed about market trends is essential.

7. Provenance: The coin's history and ownership can impact its value. Coins with well-documented provenance can be more attractive to collectors.

8. Authenticity: Ensuring that a coin is genuine and not a counterfeit is crucial. Authentic coins are more likely to appreciate, while counterfeit coins can be essentially worthless.

9. Age: In some cases, older coins have greater potential for appreciation due to their historical significance and rarity.