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, but not the best possible condition.

2. Auction History:
- The average hammer price for similar coins has been 197.22 euros.
- In previous auctions, we have seen hammer prices that varied, but some relevant examples are:
- In 2022, a coin with a condition of 80 sold for 650 euros.
- In 2024, a coin with a condition of 85 sold for 240 euros.
- In 2022, a coin with a condition of 70 sold for 70 euros.

3. Starting Price and Average Starting Price:
- The current starting price is 30 euros, and the average starting price has been 146.94 euros.

4. Price Trends:
- Given that the coin has a history of hammer prices that can be significantly higher than the starting price, it is reasonable to assume that the hammer price could be considerably greater.

Based on these factors, an estimated maximum purchase price could be in the range of 200 to 300 euros, considering that the condition is good and that the price history shows that similar coins have reached higher prices in previous auctions.

Therefore, a reasonable maximum purchase price could be 250 euros.