To estimate a maximum purchase price for the coin in question, we will consider several factors:

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

2. Starting Price: The starting price is 60 euros, which can be a good starting point for the auction.

3. Historical Prices: By looking at previous auction prices for coins with a similar condition (75), we can see that they have varied quite a bit. Some examples include:
- In 2011, a coin with a condition of 75 was auctioned for 200 euros.
- In 2013, another coin with a condition of 75 sold for 200 euros.
- In 2016, a coin with a condition of 75 was auctioned for 170 euros.

4. Average Auction Price: The average auction price for this coin is 189.62 euros, suggesting that, in general, buyers are willing to pay close to this amount.

5. Recent Trends: In the most recent auctions, the hammer prices have ranged from 80 to 140 euros for similar conditions, indicating that interest may be fluctuating.

Based on these factors, an estimated maximum purchase price for this coin could be between 180 and 220 euros. This is based on the average auction price and the hammer prices of coins with similar conditions in the past.

Therefore, a reasonable maximum purchase price could be 200 euros.