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

1. Current Condition: The coin has a condition of 75 (MBC), which indicates that it is in fairly good shape, but not the best possible condition.

2. Previous Auction Prices: By looking at the auction prices of coins with similar conditions (around 70-80), we can see that:
- In 2019, a coin with a condition of 80 was auctioned for 60 euros.
- In 2022, a coin with a condition of 80 was auctioned for 120 euros.
- In 2022, another coin with a condition of 85 was auctioned for 160 euros.

3. Price Trends: The average auction price for this coin is 132.11 euros, suggesting that, in general, coins of this reference tend to reach higher prices at auctions.

4. Starting Price: The starting price is 60 euros, which is a good starting point, but since all previous coins have sold, it is reasonable to expect that the auction price will be significantly higher.

5. Estimation: Given that the condition of the coin is 75 and considering the previous auction prices, an estimated maximum purchase price could be between 120 and 160 euros, taking into account that the price trend has been increasing and that condition is an important factor.

Therefore, an estimated maximum purchase price for this coin could be 150 euros.