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

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

2. Auction History:
- The average hammer price for this coin in the past is 89.72 euros.
- The last auction of this coin with a similar condition (80) had a hammer price of 100 euros.
- In previous auctions, hammer prices have varied, but there are examples of sales reaching up to 130 euros.

3. Starting Price: The current starting price is 60 euros, which is below the average hammer price, suggesting that there may be room for the final price to be higher.

4. Price Trends: Looking at previous auctions, it seems that coins with a condition of 80 have had hammer prices ranging between 90 and 130 euros.

Based on these factors, an estimated maximum purchase price for this coin could be in the range of 120 to 140 euros, considering that the condition is good and the price history suggests it could reach a higher price at auction.

Therefore, an estimated maximum purchase price could be 130 euros.