To estimate a maximum purchase price for the coin in question, we can analyze the provided data and consider several factors:

1. Coin Condition: The coin has a condition rating of 75 (MBC), which indicates that it is in an acceptable state, but not of the highest quality. This can influence the price, as coins in better condition tend to fetch higher prices.

2. Auction History:
- The average hammer price for this coin in the past is 112.49 euros, suggesting that, in general, buyers are willing to pay around this amount.
- The last auction with a similar condition (75) had a hammer price of 45 euros, indicating that the price can vary significantly depending on demand and condition.

3. Starting Price: The starting price is 60 euros, which is a good starting point. However, since the average hammer price is considerably higher, this suggests that there may be room for an increase in the final price.

4. Price Trends: Looking at previous hammer prices, there are examples of coins with similar conditions that have sold for prices ranging from 45 euros to 351.88 euros, indicating a wide range depending on demand at the time of the auction.

Based on these factors, an estimated maximum purchase price could be in the range of 100 to 120 euros. This is based on the average hammer price and the condition of the coin, as well as the historical auction prices.

Therefore, a reasonable maximum purchase price could be 120 euros.