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

1. Current Condition: The coin has a condition rating of 75 (MBC), indicating that it is in relatively good shape. This may positively influence its price.

2. Auction History:
- The average hammer price for this coin in the past is 211.25 euros.
- Previous hammer prices have varied, but there are examples of auctions reaching up to 420 euros (in the case of a condition rating of 85).
- Most hammer prices for similar conditions (70-80) are in the range of 140 to 360 euros.

3. Starting Price and Average Starting Price:
- The current starting price is 200 euros, which is slightly higher than the average starting price of 142 euros. This may indicate an expectation of greater interest in this auction.

4. Price Trends:
- In recent auctions, hammer prices have shown a trend of being higher than starting prices, especially for coins in good condition.

Based on these factors, an estimated maximum purchase price could be in the range of 300 to 350 euros, considering that the condition is good and that the price history suggests buyers are willing to pay more for coins in similar conditions.

Therefore, a reasonable maximum purchase price could be 350 euros.