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

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

2. Previous Prices: By looking at previous auction prices for coins with similar grades (75-80), we can see that auction prices have varied. For example:
- In 2015, a coin with a grade of 75 sold for 16 and 69.84 euros.
- In 2020, a coin with a grade of 85 sold for 70 euros.
- In 2022, a coin with a grade of 85 sold for 125 euros.

3. Average Auction Price: The average auction price for this coin is 52.88 euros, which can serve as a good indicator of the expected value.

4. Starting Price: The starting price is 20 euros, suggesting that the auctioneer expects moderate interest in the coin.

5. Auction Trends: The coin has been auctioned 45 times, of which it has sold 27 times. This indicates a consistent interest in the coin, which may increase its value.

Based on these factors, an estimated maximum purchase price could be in the range of 60 to 80 euros, considering that the grade is good and there is a history of auction prices supporting this estimate.

Therefore, a reasonable maximum purchase price could be 70 euros.

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

1. Starting price: 50 euros.
2. Average hammer price in the past: 110 euros.
3. Current condition: 70 (MBC-), which indicates a fairly good condition, although not the best.
4. Auction history: It has been auctioned 2 times in the past, with 1 sale and 1 no sale. This suggests that there is interest, but also that there may be limitations in demand.
5. Average starting price: 50 euros, indicating that the starting price has remained constant.

Given that the average hammer price in the past was 110 euros and considering that the current condition is 70, which is lower than the condition of the coins that reached that price, we could estimate a maximum purchase price that is lower than the previous average hammer price.

Taking all these factors into account, an estimated maximum purchase price could be between 80 and 100 euros. This reflects an interest in the coin, but also takes into account the condition and auction history.

Therefore, a reasonable estimated maximum purchase price would be 90 euros.

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

1. Starting Price: 25 euros.
2. Condition: The coin has a condition rating of 80 (VF+), indicating that it is in quite good shape.
3. Auction History:
- It has been auctioned 4 times in the past, of which it has sold 2 times.
- The average hammer price in previous auctions is 25 euros.
- In 2016, it was auctioned with a starting price of 47.46 euros, although the final hammer price is unknown.

4. Average Starting Price: 29.15 euros, suggesting that the market has valued this coin slightly higher on other occasions.

Given that the condition is good and the average hammer price is equal to the current starting price, but considering that there have been past auctions with higher starting prices, we could estimate a maximum purchase price.

Taking all these factors into account, an estimated maximum purchase price could be between 30 and 35 euros, considering that the condition is favorable and the auction history shows interest in the coin.

Therefore, a reasonable maximum purchase price could be 35 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, although not the best possible condition.

2. Auction History:
- The average hammer price in previous auctions is 74.93 euros.
- In past auctions, hammer prices have ranged from 22 euros to 120 euros, depending on the condition and other factors.
- The last auction for this coin had a hammer price of 35 euros, which may indicate a downward trend in interest or value for the coin.

3. Starting Price and Average Starting Price:
- The current starting price is 30 euros, which is below the average starting price of 50.7 euros. This could suggest that the coin is being auctioned at an attractive price.

4. Sales Trends: Of the 11 times it has been auctioned, it has sold on 8 occasions, suggesting there is reasonable interest in the coin.

Based on these factors, an estimated maximum purchase price could be set in a range that considers the average hammer price and the current condition. Given that the condition is 75 and considering the average hammer price of 74.93 euros, a reasonable maximum purchase price could be:

Estimated maximum purchase price: 80 euros.

This price takes into account the condition, price history, and interest in the coin, allowing for a margin for competition in the auction.

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-), which indicates that it is in fairly good shape, but not among the best qualities. This may influence its value compared to coins of higher condition.

2. Auction History:
- In the past, this coin has been auctioned 5 times, of which it has sold 4 times. This indicates that there is interest in the coin.
- Previous hammer prices have been quite variable, with a maximum price of 150 euros and a minimum of 45 euros. This suggests that the price may fluctuate depending on demand at the time of the auction.

3. Starting Price and Average Prices:
- The current starting price is 30 euros, which is lower than the average starting price of 49 euros and the average hammer price of 97.5 euros. This could indicate that there is a buying opportunity at a relatively low price.

4. Comparison with Previous Prices:
- The last auction with a similar condition (75) had a hammer price of 120 euros. Given that the condition of the coin in question is lower, it is reasonable to adjust this price downward.

Taking all these factors into account, an estimated maximum purchase price could be around 80-90 euros. This is based on the auction price history, the current condition, and the demonstrated interest in previous auctions.

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 an acceptable state, but not of the highest quality.

2. Auction History:
- It has been auctioned 12 times in the past, of which it has sold 9 times. This indicates good demand.
- The average hammer price in previous auctions is 92.09 euros, which gives us an idea of the value that buyers are willing to pay.

3. Previous Hammer Prices:
- Hammer prices for coins with a similar condition (75) have varied, but there are examples of auctions reaching up to 130 euros in the past.
- The lowest hammer price for a coin with a condition of 75 was 29.97 euros, indicating that the price can fluctuate quite a bit.

4. Current Starting Price: The starting price is 30 euros, which is quite low compared to the average hammer price.

Based on these factors, an estimated maximum purchase price could be in the range of 80 to 100 euros, considering that the average hammer price is 92.09 euros and that there are examples of higher hammer prices for coins in similar conditions.

Therefore, a reasonable maximum purchase price could be 100 euros.