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 of 70 (VF-). This is an important factor, as coins in better condition tend to reach higher prices.

2. Previous Prices: By observing previous auction prices for coins with similar conditions (70 and 80), we can see that:
- In 2018, a coin with a condition of 70 was auctioned for 60 euros.
- In 2022, a coin with a condition of 70 was auctioned for 50 euros.
- In 2020, coins with a condition of 80 were auctioned between 72 and 112 euros.

3. Average Auction Price: The average auction price for this coin is 102.68 euros, indicating that, in general, coins of this reference tend to reach higher prices.

4. Starting Price and Average Starting Price: The current starting price is 40 euros, and the average starting price in the past has been 83.55 euros. This suggests that the current starting price is relatively low compared to the historical average.

5. Sales Trends: The coin has sold in 19 of the last 21 auctions, indicating good demand.

Based on these factors, an estimated maximum purchase price could be in the range of 70 to 100 euros, considering that the condition is slightly lower than that of coins that have sold for over 100 euros in the past.

Therefore, a reasonable estimated maximum purchase price could be 90 euros. This is based on the trend of previous prices and the current condition of the coin.

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 (MS-), indicating that it is in an acceptable state, but not of the highest quality.

2. Auction History:
- The average hammer price for coins of similar condition (70) in the past has been approximately 30.67 euros.
- In previous auctions, hammer prices for coins with a condition of 70 have varied, with some examples being:
- 65 euros in December 2018.
- 60 euros in July 2022.
- 40 euros on several occasions.

3. Starting Price: The current starting price is 60 euros, indicating that the seller has reasonable price expectations.

4. Sales Trends: The coin has been auctioned 53 times, of which it has sold 30 times. This suggests there is moderate interest in the coin, but also a significant number of coins that have not sold.

5. Estimated Price: The estimated price of 100 euros in the December 2020 auction for a coin in condition 70 suggests there is potential to reach higher prices, although this depends on demand at the time of the auction.

Based on these factors, an estimated maximum purchase price could be between 60 and 80 euros, considering that the starting price is 60 euros and that, in previous auctions, coins of similar condition have reached hammer prices of up to 65-70 euros. However, if there is strong demand at the auction, it could reach up to 80 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 quite good shape. This generally translates to a higher price compared to coins in lower condition.

2. Auction History:
- The coin has been auctioned 15 times, of which it has sold 6 times. This suggests that there is moderate interest in the coin.
- The average starting price in previous auctions is 32.81 euros, and the average hammer price is 36.33 euros. This provides context regarding the market value of the coin.

3. Previous Prices:
- In recent auctions, the starting price has been 60 euros with an estimated price of 90 euros, indicating expectations for the coin to reach a higher price.
- In the most recent auction (2023-02-16), the starting price was 60 euros and the estimated price was 90 euros, suggesting that the market is willing to pay more for coins in good condition.

4. Price Trends:
- Looking at previous hammer prices, the highest recorded price was 50 euros in a 2016 auction, but in more recent auctions, the estimated price has increased, which could indicate an upward trend.

Based on these factors, an estimated maximum purchase price could be in the range of 70 to 90 euros, considering that the condition is good and there is growing interest in the coin. A price of 80 euros could be a reasonable starting point for an offer, as it falls in the middle of this range and reflects both the condition and recent market trends.