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

1. Coin Condition: The coin has a condition rating of 75 (MBC), indicating that it is in fairly good shape, but not of the highest quality (FDC).

2. Auction History:
- The average hammer price for similar coins in the past is 44.08 euros.
- Coins with a similar condition (75) have been auctioned for hammer prices of up to 160 euros (in the case of a condition of 80).
- The majority of coins with a condition of 75 have had hammer prices ranging from 20 to 50 euros.

3. Starting Price: The starting price is 25 euros, which may be a good indicator of the expected sale.

4. Recent Trends: In the most recent auctions, hammer prices for coins of similar condition have shown a range that can reach up to 50-70 euros, depending on demand and other factors.

Based on these points, an estimated maximum purchase price for this coin could be between 50 and 70 euros, considering that the condition is good and there is a price history that supports this estimate. However, since the market can be volatile, it is advisable not to exceed 70 euros to avoid overpaying.

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

1. Coin Condition: The coin to be auctioned has a condition rating of 90 (EBC), indicating that it is in quite good shape. This is important because coins in better condition tend to fetch higher prices.

2. Starting Price and Previous Prices: The current starting price is 900 euros. In previous auctions, we have seen hammer prices that varied, but there are examples of hammer prices exceeding 1000 euros, especially for similar conditions.

3. Average Hammer Price: The average hammer price for this coin is 1250.38 euros, suggesting that, in general, buyers are willing to pay more than the starting price.

4. Recent Trends: In the most recent auctions, hammer prices have ranged from 700 to 950 euros for coins with conditions of 90 and 80. However, there is also an extreme case where a similar coin sold for 16500 euros, which could be an outlier.

5. Analysis of Previous Prices: Looking at the hammer prices from previous auctions with similar conditions, the highest recorded price was 16500 euros, but this seems to be an exceptional case. Most hammer prices for conditions between 80 and 90 are in the range of 700 to 950 euros.

Based on these factors, an estimated maximum purchase price for the coin in question could be in the range of 1200 to 1400 euros, considering that the average hammer price is 1250.38 euros and that the coin's condition is good. However, since the starting price is 900 euros, it is likely that buyers will be willing to bid more, especially if there is interest in the coin.

Therefore, a reasonable maximum purchase price could be 1300 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 90 (EF), indicating that it is in quite good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Starting Price: The starting price is 1800 euros, which is a good starting point for the estimation.

3. Price History: By looking at previous auction prices for coins with similar conditions (90 or close), we can see that in recent auctions, hammer prices have ranged between 1450 and 1700 euros for coins in similar conditions.

4. Auction Trends: In the most recent auctions, hammer prices have shown an upward trend, especially for coins in good condition. For example, in previous auctions, coins with a condition of 90 have reached hammer prices of up to 1700 euros.

5. Average Hammer Price: The average hammer price for this coin is 1365.75 euros, which can also serve as a reference.

Taking all these factors into account, an estimated maximum purchase price for this coin could be around 2000 euros. This is based on the good condition of the coin, the starting price, and the hammer price history for similar coins.