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 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. Current Listing Price and Previous Prices: The current listing price is 600 euros, which is significantly higher than the average listing price of 278.76 euros. However, the average hammer price is 412.26 euros, suggesting that the market has been willing to pay less than the current listing price in previous auctions.

3. Sales History: The coin has sold in 4 out of the last 6 auctions, indicating a consistent interest in the coin. However, it should also be noted that there have been 2 occasions when it did not sell.

4. Previous Hammer Prices: Previous hammer prices varied, but the highest was 1100 euros in a recent auction with a condition of 95. This suggests that the price could increase significantly with better condition.

5. Price Trends: Observing previous hammer prices, the price has been increasing, especially in the more recent auctions. This could indicate an upward trend in interest for this coin.

Considering all these factors, an estimated maximum purchase price could be in the range of 600 to 800 euros, given that the listing price is 600 euros and the condition is good, but not exceptional. A price of 800 euros could be a reasonable limit, given the price history and current condition.

To estimate a maximum purchase price for the coin in question, we can analyze the provided data, especially the previous auction prices and the current condition of the coin.

1. Current Condition: The coin has a condition of 75 (VF), which is a medium-low condition. This suggests that the auction price could be lower than that of coins in better condition.

2. Previous Auction Prices:
- In the past, coins with a similar condition (75) have had auction prices that vary significantly. For example, in previous auctions, the auction prices for coins with a condition of 75 have ranged between 170 and 700 euros, depending on other factors such as demand and rarity of the coin.

3. Average Auction Price: The average auction price for this coin is 406.31 euros, indicating that, in general, coins of this reference tend to sell for relatively high prices.

4. Starting Price: The current starting price is 175 euros, which is quite low compared to the average auction price.

5. Estimation: Given that the condition is 75 and considering the previous auction prices, a reasonable maximum purchase price could be in the range of 300 to 400 euros. This is based on the fact that, although the coin is not in the best condition, its demand and price history suggest it could reach a higher price than the starting price.

Therefore, an estimated maximum purchase price for this coin could be approximately 350 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 of 70 (VF-). This indicates that it is in an acceptable state, but not of high quality.

2. Historical Prices: By looking at previous auction prices for coins with a similar condition (70-75), we can see that auction prices have varied. For example, in past auctions, coins with a condition of 75 have reached hammer prices of up to 400 euros.

3. Starting Price and Average Price: The current starting price is 140 euros, and the average hammer price in the past has been 406.31 euros. This suggests that there is significant potential for the hammer price to be higher than the starting price.

4. Market Trends: Since the coin has been auctioned 656 times and has had a high number of sales (573), this indicates a constant interest in this coin, which may influence the price.

5. Comparison with Prices of Similar Condition: In the past, coins with a condition of 70 have had hammer prices ranging from 150 to 300 euros, depending on demand and other factors.

Based on these points, an estimated maximum purchase price for this coin could be between 250 and 350 euros, considering the interest in the coin and its current condition. This allows for a margin for competition in the auction, but also remains within a reasonable range based on historical data.