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 relatively good shape. This suggests that its price could be in the upper range of previous auctions.

2. Previous Auction Prices: By looking at the auction prices of coins with a similar condition (around 80), we can see that they have reached auction prices that vary, but some have been quite high. For example, in previous auctions, coins with a condition of 80 have reached auction prices of up to 120-180 euros.

3. Average Auction Price: The average auction price for this coin is 179.01 euros, which also indicates that the final auction price may be considerably higher than the starting price.

4. Auction Trends: The coin has been auctioned 93 times, of which 85 have been sold. This indicates a consistent interest in the coin, which may increase its value at auction.

5. Starting Price: The starting price is 125 euros, which is a good starting point, but given the history of auction prices, it is likely that the final price will be higher.

Based on these factors, an estimated maximum purchase price could be in the range of 200 to 250 euros. This is based on the auction price history for coins of similar condition and the demonstrated interest in previous auctions.