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), indicating that it is in fairly good shape, but not among the highest qualities.

2. Auction History:
- The average hammer price in previous auctions is 80.59 euros.
- The condition of coins auctioned in the past has varied, but there are examples of coins with similar conditions that have sold for prices ranging from 35 to 140 euros, depending on the condition and demand at that time.

3. Starting Price and Estimated Price:
- The current starting price is 20 euros, and the average starting price in the past has been 50.21 euros. This suggests that the current starting price is relatively low compared to the historical average.

4. Recent Trends: In the most recent auctions, hammer prices have reached up to 110 euros for coins with similar conditions.

Based on these factors, an estimated maximum purchase price could be set in a range between 80 and 120 euros, considering that the coin has a condition of 75 and that interest in the auction may influence the final price.

Therefore, a reasonable maximum purchase price could be 100 euros. This allows for a margin for competition in the auction, given that the average hammer price is 80.59 euros and there are examples of higher sales in the past.

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

1. Current Condition: The coin has a condition rating of 70 (VF-), indicating that it is in acceptable shape, but not among the best qualities. This can influence the price, as coins in better condition tend to fetch higher prices.

2. Auction History:
- The average hammer price for similar coins in the past is 42.11 euros.
- The coin has been auctioned 10 times, of which it has sold 9 times, indicating good demand.
- In previous auctions, hammer prices have varied, but there are examples of hammer prices reaching up to 100 euros for coins in better condition.

3. Starting Price and Average Starting Price:
- The current starting price is 18 euros, which is relatively low compared to the average starting price of 38.36 euros.

4. Recent Trends: In the most recent auction, the coin sold for 45 euros with a condition rating of 80, suggesting that there is growing interest in coins of acceptable quality.

Based on these factors, an estimated maximum purchase price could be in the range of 40 to 50 euros, considering that the condition is a limiting factor and that the average hammer price is 42.11 euros. Therefore, a reasonable maximum purchase price could be 45 euros.

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

1. Current Condition: The coin has a condition of 70 (MS-). This is an important factor, as coins in better condition tend to reach higher prices.

2. Auction History:
- The average hammer price for coins with a similar condition (70) has been approximately 20-25 euros in previous auctions.
- In past auctions, hammer prices for coins with a condition of 70 have varied, but there have been hammer prices of up to 32 euros in a 2013 auction.

3. Starting Price and Average Hammer Price:
- The current starting price is 18 euros, and the average hammer price is 26.75 euros. This suggests that there is potential for an increase in the hammer price.

4. Recent Trends: In recent auctions, the hammer price has been around 18-30 euros for coins with similar conditions.

Based on these factors, an estimated maximum purchase price could be between 30 and 35 euros, considering that interest in the coin may vary and that condition is a key factor in its value. However, it is important to keep in mind that the final price will depend on the competition in the auction and the interest of other collectors.