To estimate a maximum purchase price for the coin in question, we can analyze the provided data, especially the previous auction prices and the current condition of the coin.

1. Condition: The coin has a condition rating of 95 (EF+), indicating that it is in very good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Previous auction prices: By looking at the auction prices of coins with a similar condition (95), we can see that they have reached auction prices of up to 130 euros in recent auctions. For example:
- In 2024, a coin with a condition of 95 was auctioned for 130 euros.
- In 2024, another coin with a condition of 95 was auctioned for 95 euros.

3. Price trends: The average auction price for this coin is 34 euros, but this may be influenced by coins of lower condition. Given that the condition of this coin is high, it is reasonable to expect that the auction price will be above this average.

4. Starting price: The starting price is 20 euros, suggesting that the auctioneer expects moderate interest in the coin.

5. Estimation: Based on the condition, previous auction prices, and market context, an estimated maximum purchase price could be between 80 and 130 euros. This is because, although the highest recorded auction price was 130 euros, it is prudent to consider a more conservative range for the estimation.

Therefore, an estimated maximum purchase price for this coin could be 100 euros. This reflects a balance between the high condition and previous auction prices while maintaining a realistic perspective on market interest.