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

1. Coin 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 coins with a similar condition (80) has been 114.67 euros.
- In previous auctions, coins with a condition of 80 have reached hammer prices of up to 295 euros (in 2017).
- The trend of hammer prices for coins in condition 80 has generally been positive, with several auctions exceeding 100 euros.

3. Starting Price and Average Starting Price:
- The current starting price is 60 euros, which is below the average starting price of 71.56 euros. This suggests that there is potential for the hammer price to be higher.

4. Supply and Demand: The coin has been auctioned 47 times in the past, with an 85% sell-through rate (40 out of 47). This indicates good demand, which can push the price up.

5. Previous Estimated Prices: Estimated prices in previous auctions for coins in condition 80 have varied, but many have been in the range of 90 to 200 euros.

Based on these factors, an estimated maximum purchase price for this coin could be in the range of 120 to 150 euros, considering that the condition is good and there is a history of hammer prices that supports this estimate. However, given the history of higher prices, a maximum purchase price could reasonably be set at 150 euros.