To estimate a maximum purchase price for the coin in question, we can consider several factors:

1. Coin Condition: The coin has a condition of 80 (MBC+), which indicates that it is in quite good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Previous Auction Prices: By observing the auction prices of coins with a similar condition (80), we can see that they have reached auction prices that vary, but generally, auction prices for coins in MBC+ condition tend to be in a range of 40 to 110 euros, depending on demand and other factors.

3. Average Auction Price: The average auction price for this coin is 153.86 euros, suggesting that there is a higher selling potential, especially if demand is strong.

4. Auction Trends: The coin has been auctioned 101 times, with a high sales percentage (92 out of 101). This indicates a consistent interest in this coin, which can influence the price.

5. Starting Prices and Estimates: The starting price is 25 euros, and the average starting price is 62.11 euros. This suggests that the auction price could be significantly higher than the starting price.

Taking all these factors into account, an estimated maximum purchase price for this coin could be in the range of 150 to 200 euros. This is based on the condition, previous auction prices, and the general auction trend. However, the final price will depend on the competition in the auction and the demand at that specific moment.