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 (VF), indicating that it is in fairly good shape, although not the best possible condition.

2. Historical Prices: Looking at previous auction prices, we can see that the coin has reached auction prices that vary significantly, ranging from 190 to 1800 euros, depending on the condition and the auction context.

3. Average Hammer Price: The average hammer price for this coin is 646.54 euros, which gives us a good reference for what buyers are willing to pay.

4. Current Starting Price: The starting price is 200 euros, which may attract more bidders.

5. Auction Trends: The coin has been sold every time it has been auctioned, suggesting a consistent demand.

Given that the coin's condition is 75 (VF), which is an acceptable state, and considering the average hammer price and historical prices, an estimated maximum purchase price could be around 800-1000 euros. This is based on the fact that, although the starting price is low, the trend of previous hammer prices and the condition suggest that it could reach a higher price at auction.

Therefore, an estimated maximum purchase price could be approximately 900 euros.

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

1. Starting price: 40 euros.
2. Condition: The coin has a condition rating of 70 (VF-), indicating that it is in quite good shape.
3. Auction history: It has been auctioned 2 times in the past and sold on both occasions, suggesting that there is demand for this coin.
4. Average hammer price: 310 euros, indicating that, in general, coins of this reference tend to reach much higher prices than the starting price.
5. Previous prices: In the most recent auction, the coin was offered with a starting price of 80 euros and sold for 420 euros, showing significant interest and an increase in value.

Given that the condition of this coin is good and considering the auction price history, an estimated maximum purchase price could be in a range between the average hammer price and the starting price.

Taking all these factors into account, an estimated maximum purchase price could be around 350 to 400 euros. This is based on the interest shown in previous auctions and the condition of the coin.

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 85 (ebc-), indicating that it is in quite good shape. This suggests that its value should be in the upper range of previous auctions.

2. Previous Auction Prices: By looking at the hammer prices of coins with similar conditions (85), we can see that they have reached hammer prices of up to 500 euros in the past. However, most hammer prices for condition 85 have been in the range of 140 to 265 euros.

3. Average Hammer Price: The average hammer price for this coin is 141.7 euros, which can also serve as an indicator of its value.

4. Starting Price and Average Starting Price: The current starting price is 70 euros, and the average starting price is 91.75 euros. This suggests that the starting price is relatively low compared to previous hammer prices.

5. Recent Trends: In the most recent auctions, hammer prices have varied, but there are examples of coins with similar conditions that have reached hammer prices of 210 euros or more.

Based on these factors, an estimated maximum purchase price for the coin could be in the range of 200 to 250 euros, considering that the condition is good and there are precedents of higher hammer prices in the past.

Therefore, a reasonable estimated maximum purchase price could be 250 euros.