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

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

2. Auction History:
- The average hammer price for similar coins has been 162.22 euros.
- In previous auctions, we have seen hammer prices that varied depending on the condition:
- A coin with a condition of 95 was sold for 800 euros.
- A coin with a condition of 80 was sold for 30 euros.
- A coin with a condition of 70 was sold for 170 euros.
- A coin with a condition of 85 was sold for 90 euros.

3. Price Trends:
- The average starting price has been 71 euros, suggesting that buyers are often willing to pay more than the starting price.
- The coin with a condition of 75 (like the current one) has had a hammer price of 170 euros in the past.

4. Comparison with Previous Prices:
- The condition of 75 is similar to other coins that have sold in the range of 170 euros, and considering that the average hammer price is 162.22 euros, we can infer that the hammer price for this coin could be in a similar range.

Based on these factors, an estimated maximum purchase price for the coin in question could be between 150 and 200 euros, with 200 euros being a reasonable upper limit given the price history and current condition.

Therefore, an estimated maximum purchase price could be 200 euros.