To estimate a maximum purchase price for the coin in question, let's consider several factors:

1. Current Condition: The coin has a condition rating of 80 (MBC+), indicating that it is in relatively good shape, but not the best possible condition.

2. Starting Price: The starting price is 200 euros, which sets a baseline for the auction.

3. Sales History:
- The average hammer price in previous auctions is 232.74 euros.
- In recent auctions, we have seen hammer prices that vary, with some reaching up to 400 euros in similar conditions.

4. Recent Trends: In the most recent auctions, hammer prices have shown a range from 245 euros to 400 euros, depending on the condition and demand at that time.

5. Comparison with Previous Prices: In past auctions, coins with similar conditions have reached hammer prices that exceed the current starting price.

Based on these factors, an estimated maximum purchase price could be in the range of 300 to 350 euros, considering that the coin is in good condition and that interest in coins of this type may vary. Therefore, a reasonable maximum purchase price could be 350 euros.