To estimate a maximum purchase price for the coin that will be auctioned, we can consider several factors based on the provided data:

1. Current Condition: The coin has a condition rating of 90 (EF), indicating that it is in good shape. This is a positive factor that can increase its value.

2. Starting Price: The starting price is 225 euros. This is the baseline for the auction.

3. Sales History: The coin has been auctioned 55 times, of which it has sold 42 times. This indicates good demand and a history of successful sales.

4. Previous Prices: By looking at previous hammer prices for coins with a similar condition (90), we can see that they have reached hammer prices that vary, but some have reached up to 340 euros (as in the auction on March 16, 2023).

5. Average Hammer Price: The average hammer price for this coin is 188.56 euros, which can serve as a reference for establishing a price range.

6. Recent Trends: In the most recent auctions, hammer prices have shown an increase, suggesting that demand may be growing.

Based on these factors, an estimated maximum purchase price could be set between the starting price and 20-30% above it, considering the good condition and sales history.

Therefore, an estimated maximum purchase price could be:

Estimated maximum purchase price: 300 euros.

This price reflects both the condition value and the price trend in previous auctions.

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 90 (EF), indicating that it is in quite good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Previous Prices: By looking at previous auction prices for coins with a similar condition (90), we can see that they have reached hammer prices of up to 340 euros in recent auctions. For example, at the auction on March 16, 2023, a coin with a condition of 95 was sold for 340 euros.

3. Starting Price and Average Hammer Price: The current starting price is 225 euros, and the average hammer price in the past has been 188.56 euros. This suggests that the starting price is reasonable, but it also indicates that the hammer price may be lower than the starting price.

4. Auction Trends: The coin has been auctioned 55 times, with a 76% sell-through rate (42 out of 55). This suggests that there is consistent interest in this coin, which may influence its price.

5. Price Estimates: In previous auctions, estimated prices for coins of similar condition have varied, but some have reached up to 400 euros. However, it is important to be conservative in the estimation.

Taking all these factors into account, an estimated maximum purchase price for this coin could be around 300-350 euros. This is based on the condition, previous hammer prices, and general interest in the coin.

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

1. Current Condition: The coin has a condition of 75 (VF), which indicates that it is in an acceptable state, but not of high quality. This may influence the price, as coins in better condition tend to fetch higher prices.

2. Previous Hammer Prices: By observing the hammer prices of coins with a similar condition (75 and 80), we can see that:
- In 2018, a coin with a condition of 75 was auctioned for 14 euros.
- In 2022, another coin with a condition of 75 was auctioned for 75 euros.
- In 2023, a coin with a condition of 90 was auctioned for 230 euros, indicating that the price can increase significantly with better condition.

3. Average Hammer Price: The average hammer price for this coin is 346.66 euros, but this includes coins in better condition. Given that the condition of the coin in question is 75, it is reasonable to expect that the hammer price will be below this average.

4. Auction Trends: The coin has been auctioned 47 times, of which 44 have sold. This suggests that there is a consistent interest in this coin, which may increase its value at auction.

5. Starting Price: The starting price is 35 euros, which may be a good indicator of an expected minimum price.

Based on these factors, an estimated maximum purchase price for the coin with a condition of 75 could be between 100 and 150 euros, considering that this is a reasonable price for a coin in this state and that it has had previous hammer prices in a similar range. However, if there is strong competition at the auction, the price could exceed this estimate.

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 75 (MBC), which indicates that it is in fairly good shape, but not the best possible condition.

2. Auction History:
- The average hammer price in previous auctions is 69.96 euros.
- The coin has been auctioned 16 times, of which it has sold 10 times, indicating a reasonable sell-through rate.
- Previous hammer prices for coins with similar conditions (75) have varied, but there are examples of hammer prices around 66.83 euros and 163.76 euros for a condition of 75.

3. Starting Price: The starting price is 25 euros, which is quite low compared to the average hammer price.

4. Price Trends: Given that the average starting price is 61.15 euros, and considering that the condition of the coin is 75, it is reasonable to think that the hammer price could be in a range above the starting price.

Based on these factors, an estimated maximum purchase price could be positioned between the average hammer price and a bit more, given that the condition is good.

Estimated Maximum Purchase Price:

We could estimate a maximum purchase price around 80-90 euros. This is based on the auction price history and the current condition of the coin.