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

1. Coin Condition: The coin has a condition rating of 80 (MS+), indicating 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 looking at the hammer prices of coins with a similar condition (80), we can see that they have reached hammer prices that vary significantly. For example, in previous auctions, coins with a condition of 80 have reached hammer prices of up to 90 euros.

3. Average Hammer Price: The average hammer price for this coin is 137.95 euros, suggesting that, in general, coins of this reference tend to sell for higher prices.

4. Auction Trends: The coin has been auctioned 168 times, of which 150 have been sales. This indicates good demand and sustained interest in this coin.

5. Starting Prices and Estimates: The starting price is 35 euros, and the average starting price is 82.48 euros. This suggests that the current starting price is relatively low compared to the average hammer price.

Based on these factors, an estimated maximum purchase price for this coin could be between 120 and 150 euros, considering that the condition is good and that interest in the coin is high. However, given that the average hammer price is 137.95 euros, a more conservative purchase price could be around 130 euros.