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

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

2. Previous Auction Prices: By looking at the hammer prices from previous auctions for coins with a similar condition (75-80), we can see that prices have varied. For example:
- In 2013, it sold for 117.19 with a condition of 80.
- In 2020, it sold for 135 with a condition of 80.
- In 2022, it sold for 150 with a condition of 80.

3. Average Hammer Price: The average hammer price for this coin is 152.56, suggesting that, in general, buyers are willing to pay around this amount.

4. Starting Price: The starting price is 40 euros, which is quite low compared to previous hammer prices.

5. Recent Trends: In the most recent auctions, hammer prices have ranged from 130 to 380 euros, indicating growing interest in this coin.

Taking all these factors into account, an estimated maximum purchase price for this coin could be in the range of 150 to 200 euros, considering that the condition is good and that interest in the coin seems to be increasing. However, since the starting price is 40 euros, it is likely that it can be acquired for a price below this range, depending on the competition in the auction.