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 70 (MBC-), indicating that it is in acceptable condition but not of high quality. This may influence the price, as coins in better condition typically fetch higher prices.

2. Current Listing Price and Previous Prices: The current listing price is 60 euros. In previous auctions, the average hammer price has been 167.6 euros, suggesting that there is significant potential for the hammer price to be much higher than the listing price.

3. Auction History: The coin has been auctioned 92 times, of which it has sold 85 times. This indicates good demand and a history of successful sales. Additionally, the average hammer price in previous auctions for coins of similar condition (70) has ranged from 65 to 130 euros.

4. Price Trends: Looking at the hammer prices of coins with similar condition, the highest recorded price for a coin with a condition of 70 has been 130 euros. However, there are examples of coins in better condition that have reached much higher prices, suggesting that the market may be willing to pay more for quality coins.

Based on these factors, an estimated maximum purchase price for this coin could be in the range of 120 to 150 euros. This is based on the auction price history and the condition of the coin. Therefore, a reasonable maximum purchase price could be 150 euros.