To estimate a maximum purchase price for the coin in question, we can analyze the provided data, especially the coin's condition, previous auction prices, and market behavior.

1. Coin Condition: The coin has a condition of 70 (MBC-), indicating that it is in acceptable shape but not of high quality. This generally affects the auction price.

2. Previous Auction Prices: By observing the auction prices of coins with a similar condition (70), we can see that the auction prices have varied. For example:
- In previous auctions, coins with a condition of 70 have reached auction prices ranging from 50 to 100 euros.
- The average auction price for coins of similar condition is approximately 60-70 euros.

3. Average Auction Price: The average auction price for this particular coin is 101.29 euros, suggesting that, despite its condition, there is significant interest in this coin.

4. Market Trends: Given that the coin has been auctioned 177 times and has had a high sales percentage (151 out of 177), this indicates a consistent demand.

5. Starting Price: The starting price is 35 euros, which is relatively low compared to previous auction prices.

Based on these factors, an estimated maximum purchase price for this coin could be between 80 and 120 euros, considering that the condition is a limiting factor, but also that there is interest in the coin that could drive its price up at auction.

Therefore, a reasonable maximum purchase price could be 100 euros.