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 quite good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Auction History:
- The average hammer price for similar coins has been 76.73 euros.
- In previous auctions, hammer prices have varied significantly, but some have reached up to 210 euros under similar conditions (as seen in the auction on January 25, 2022).

3. Starting Price and Average Starting Price:
- The current starting price is 60 euros, which is above the average starting price of 40.55 euros. This suggests an expectation that the coin will sell for a higher price.

4. Sales Trends: Out of the 22 times it has been auctioned, 16 have resulted in sales, indicating good demand.

5. Comparison with Previous Prices:
- In past auctions, hammer prices have varied, but there are examples of coins in similar conditions that have sold for significantly higher prices.

Taking all these factors into account, an estimated maximum purchase price could be in the range of 100 to 130 euros. This is based on the hammer price history and the good condition of the coin. However, since the market can be volatile, it is advisable to keep an eye on the auction and adjust the bid accordingly.