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), indicating a medium-low state of preservation. This generally affects the price, as coins in better condition tend to reach higher prices.

2. Auction History:
- The average hammer price for coins with a similar condition (75) in the past has been approximately 30-40 euros.
- In recent auctions, hammer prices for coins with a condition of 75 have ranged between 24 and 38 euros.

3. Price Trends:
- The average starting price has been 30.47 euros, and the average hammer price has been 36.09 euros. This suggests that buyers are willing to pay a little more than the starting price.

4. Previous Auction Prices:
- In previous auctions, hammer prices for coins with a condition of 75 have varied, but the range has generally been between 18 and 40 euros.

5. Auction Expectations: Since it will be auctioned in the coming days, prices may be influenced by current demand and collector interest.

Based on these factors, an estimated maximum purchase price for this coin could be in the range of 40 to 50 euros. This range takes into account the condition, price history, and current market trend.