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

1. Current Condition: The coin has a condition of 75 (MBC), indicating that it is in an acceptable state, but not among the best conditions.

2. Auction History:
- The average hammer price for similar coins is 161.65 euros.
- In previous auctions, hammer prices have varied, with some reaching up to 550 euros in superior conditions (such as in the auction on 2022-03-17 with a condition of 95).

3. Price Trends:
- The coin had a starting price of 100 euros in this auction, which is a reasonable starting point.
- The average starting price in the past has been 102.17 euros, suggesting that the current starting price is competitive.

4. Comparison with Previous Prices:
- In previous auctions, coins with similar conditions have had hammer prices ranging from 76 to 320 euros, depending on the condition and demand.

5. Estimation Based on Condition:
- Given that the condition of this coin is 75, an estimated hammer price could be in the lower range of the highest observed prices, but still significant.

Taking all these factors into account, an estimated maximum purchase price for this coin could be between 150 and 200 euros. This is based on the hammer price history and the current condition of the coin. A price of 180 euros could be a reasonable target, as it falls in the middle of this range and is consistent with previous hammer prices for coins in similar conditions.