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 among the best qualities.

2. Historical Prices: By looking at previous auction prices for coins with similar conditions (75 and 80), we can see that the hammer price has varied. For example:
- In previous auctions, coins with a condition of 75 have reached hammer prices of up to 55-70 euros.
- Coins with a condition of 80 have reached hammer prices of up to 110 euros.

3. Average Hammer Price: The average hammer price for this coin has been 94.87 euros, suggesting that there is considerable interest in this coin.

4. Starting Price and Average Starting Price: The current starting price is 50 euros, and the average starting price is 62.89 euros. This indicates that the starting price is below average, which could make the coin attractive to buyers.

5. Recent Trends: In the most recent auctions, the hammer price has been around 80-110 euros for similar conditions.

Based on these factors, an estimated maximum purchase price for this coin could be between 80 and 110 euros, considering that the interest in the coin and its condition are favorable. A price of 100 euros could be a reasonable target, as it falls in the middle of this range and reflects both historical interest and current condition.