To estimate a maximum purchase price for the coin with a grade of 80 (MBC+), we can analyze historical data from previous auctions of coins with the same grade and hammer prices.

1. Historical Auction Data:
- The grade of 80 (MBC+) has had hammer prices that vary significantly. For example, in previous auctions, hammer prices for coins with similar grades have ranged from 170 to 700 euros, depending on demand and other factors.

2. Average Hammer Price:
- The average hammer price for coins of this reference is approximately 406.31 euros. This suggests that, in general, buyers are willing to pay around this amount.

3. Price Trends:
- Observing the trends, it seems that coins with a grade of 80 (MBC+) tend to reach hammer prices that can be slightly higher than the average starting price, especially if there is interest in the auction.

4. Additional Considerations:
- Given that the starting price is 250 euros and the average hammer price is 406.31 euros, a reasonable maximum purchase price could be slightly higher than the average hammer price, considering the grade and demand.

Estimated Maximum Purchase Price:
Taking all these factors into account, an estimated maximum purchase price for the coin with a grade of 80 (MBC+) could be around 450-500 euros. This allows for some competition in the auction and reflects the price trend observed in the past.

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

1. Current Condition: The coin has a condition rating of 70 (VF-), indicating that it is in acceptable shape, but not among the best qualities. This can influence the price, as coins in better condition tend to fetch higher prices.

2. Auction History: The coin has been auctioned 25 times in the past, of which it has sold 17 times. This indicates a consistent interest in the coin, which can increase its value.

3. Previous Auction Prices:
- The average starting price is 23.67 euros, and the average hammer price is 29.35 euros.
- In previous auctions, hammer prices have varied, but there are examples of sales reaching up to 65 euros under similar conditions.

4. Recent Trends: In the most recent auctions, the hammer price has been around 45 euros, suggesting that interest in the coin remains steady.

5. Current Starting Price: The starting price is 15 euros, which is relatively low compared to previous hammer prices.

Taking all these factors into account, an estimated maximum purchase price could be in the range of 40 to 50 euros. This is based on the history of hammer prices and the current condition of the coin. However, since interest may vary and the auction may attract different bidders, it is advisable to be prepared to bid a little higher if competition is strong.

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

1. Current Condition: The coin has a condition of 75 (MBC), indicating that it is in an acceptable state, but not of the highest quality.

2. Auction History:
- The average hammer price for similar coins in the past is 273.54 euros.
- The condition of the coins auctioned in the past varies, but there are examples of coins with similar conditions (75-85) that have sold for prices ranging between 200 and 300 euros.

3. Previous Hammer Prices:
- In previous auctions, coins with conditions of 75 have had hammer prices ranging from 150 to 280 euros.
- The most recent auction with a similar condition (75) had a hammer price of 190 euros.

4. Price Trends:
- The general trend seems to be that coins with a condition of 75 can reach hammer prices in the range of 200 to 300 euros, depending on demand and other market factors.

Based on these points, an estimated maximum purchase price for the coin in question could be around 280-300 euros, considering that the average hammer price is 273.54 euros and that the condition is acceptable. However, since the coin is not of the best conditions, a more conservative price could be 250-280 euros.

Therefore, a reasonable estimated maximum purchase price would be approximately 280 euros.

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 an acceptable state, but not among the best qualities.

2. Starting Price: The starting price is 2000 euros, which is a good starting point.

3. Auction History:
- The average hammer price for similar coins in the past has been 2833.74 euros.
- It has been auctioned 62 times, of which 45 have been sold, indicating good interest in the coin.
- In previous auctions, hammer prices have varied significantly, with some reaching very high figures (for example, 18263.26 euros in 2011 for a coin with a condition of 90).

4. Price Trends:
- The average hammer price for coins of similar condition (75) has been lower than the overall average, but still, there have been auctions where prices exceeded 2000 euros.

5. Comparison with Previous Prices:
- In previous auctions, coins with a condition of 75 have had hammer prices ranging between 1300 and 3700 euros, depending on demand and other factors.

Based on this data, an estimated maximum purchase price for this coin could be in the range of 3000 to 3500 euros, considering that interest in the coin is high and the average hammer price is 2833.74 euros. This allows for some competition in the auction, while also remaining within a reasonable range given the price history.