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

1. Current Condition: The coin has a condition of 75 (MBC), indicating that it is in fairly good shape, but not the best possible condition.

2. Auction History:
- In the past, the coin has been auctioned 4 times, of which it has sold 3 times.
- Previous hammer prices have been 1100, 1400, and 900 euros, with an average hammer price of approximately 1133.33 euros.

3. Current Starting Price: The starting price is 900 euros, which is slightly higher than the average starting price of 825 euros.

4. Price Trends:
- In the most recent auction (2024), the coin sold for 900 euros with a condition of 85, suggesting that the market is willing to pay around this price for coins in similar conditions.
- In previous auctions, hammer prices have been higher, especially when the condition was better (85 or above).

5. Maximum Price Estimate: Given that the current condition is 75, and considering that in previous auctions with similar conditions, hammer prices have reached up to 1100 euros, a reasonable maximum purchase price could be in the range of 1000 to 1100 euros. This is based on the fact that buyers may be willing to pay a little more than the most recent lower hammer price (900 euros) if demand is high.

Therefore, an estimated maximum purchase price for this coin could be approximately 1100 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 fairly good shape, but not the best possible condition.

2. Auction History:
- The average hammer price in previous auctions is 214.09 euros.
- The last auction with a similar condition (75) had a hammer price of 300 euros.
- Overall, hammer prices have varied, but there are examples of sales exceeding 300 euros.

3. Starting Price: The starting price is 300 euros, indicating that the seller has high expectations for this auction.

4. Price Trends: Looking at previous hammer prices, it seems there is consistent interest in this coin, and prices have shown a trend of increasing in recent auctions.

Based on these factors, an estimated maximum purchase price could be around 350-400 euros. This is because, although the starting price is 300 euros, the auction history and current condition suggest that there may be competition in the auction, which could lead to a higher hammer price.

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

1. Coin Condition: The coin to be auctioned has a condition rating of 80 (MBC+). This is an important factor, as coins in better condition tend to fetch higher prices.

2. Previous Auction Prices:
- The coin has been auctioned several times with starting prices ranging from 600 to 900 euros.
- Previous hammer prices (when sold) have reached up to 1600 euros in the most recent case (2024) for a coin with a condition rating of 95, indicating that the market may be willing to pay high prices for quality coins.

3. Average Hammer Price: The average hammer price for previous auctions is 1030 euros, suggesting that, in general, coins of this reference tend to sell above their starting price.

4. Sales Trends: Of the 8 times it has been auctioned, it has sold on 4 occasions, indicating interest in the coin, but also that there is a 50% non-sale rate in the past, which may influence the perception of value.

5. Estimated Price: The estimated starting price for this auction is 600 euros, which is relatively low compared to previous hammer prices.

Based on these factors, an estimated maximum purchase price could be in the range of 1000 to 1200 euros, considering that the condition is good (80) and that there seems to be interest in the coin. However, since the highest hammer price in the past has been 1600 euros, it is possible that a buyer may be willing to pay a bit more if competition is high at the auction.

Therefore, a reasonable maximum purchase price could be 1200 euros.