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

1. Current Condition: The coin has a condition rating of 80 (MBC+), indicating that it is in quite good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Previous Prices: By looking at previous auction prices for coins with similar conditions (80-85), we can see that the hammer price has varied but has reached significant figures. For example:
- In 2022, a coin with a condition of 80 was auctioned for 230 euros.
- In 2023, another coin with a condition of 85 was auctioned for 290 euros.

3. Starting Price and Average Hammer Price: The current starting price is 225 euros, and the average hammer price in the past has been 179.65 euros. However, given that the condition is good, it is reasonable to expect that the hammer price will be above this average.

4. Recent Trends: In the most recent auctions, hammer prices have shown an upward trend, especially for coins in good condition. This suggests that collectors are willing to pay more for well-preserved coins.

5. Estimation Based on Historical Data: Given that the highest hammer price for a coin with a similar condition has been 290 euros, and considering that the condition of this coin is 80, an estimated maximum purchase price could be in the range of 250 to 300 euros.

Conclusion: Based on the previous analysis, an estimated maximum purchase price for this coin could be approximately 280 euros. This reflects both the good condition and recent trends in the market.