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

1. Coin Condition: The coin has a condition rating of 80 (VF+), indicating that it is in quite good shape. This suggests that its value should be above that of coins with lower conditions.

2. Previous Auction Prices: By looking at the auction prices of coins with a similar condition (around 80), we can see that the auction prices have varied. For example:
- In previous auctions, coins with a condition of 80 have reached hammer prices of 60, 70, and even 112 euros.
- The general trend shows that coins in good condition tend to sell for above 60 euros.

3. Average Hammer Price: The average hammer price for this coin is 104.05 euros, which also indicates that the coin's value could be considerably high.

4. Starting Price: The starting price is 30 euros, which is relatively low compared to previous hammer prices.

5. Estimation: Given that the condition is good and considering previous hammer prices, an estimated maximum purchase price could be between 100 and 120 euros. This is based on the fact that the average hammer price is 104.05 euros and that coins in similar conditions have reached hammer prices of up to 112 euros.

Therefore, an estimated maximum purchase price for this coin could be 120 euros.