To estimate a maximum purchase price for the coin with a grade of 70 (MBC-), we can analyze historical data from previous auctions of coins with the same grade and hammer prices.

1. Relevant data from previous auctions:
- The grade of 70 (MBC-) has had hammer prices that vary, but generally, the hammer prices for coins with similar grades have been in a range of 12 to 50 euros.
- In previous auctions, the hammer prices for coins with grades of 70 have been:
- 12 euros (hammer price)
- 18 euros (hammer price)
- 20 euros (hammer price)
- 25 euros (hammer price)
- 30 euros (hammer price)
- 35 euros (hammer price)
- 40 euros (hammer price)
- 50 euros (hammer price)

2. Analysis of hammer prices:
- The average hammer price for coins with similar grades seems to be around 25-30 euros, with some cases reaching up to 50 euros.
- Given that the starting price of the coin is 12 euros, and considering that there has been interest in coins of similar grade, a hammer price of 30-40 euros seems reasonable.

3. Estimation of the maximum purchase price:
- Based on the previous analysis, an estimated maximum purchase price for this coin could be between 30 and 50 euros, with 40 euros being a reasonable midpoint.

Therefore, the estimated maximum purchase price for the coin with a grade of 70 (MBC-) would be 40 euros.

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 80 (MBC+), indicating that it is in relatively good shape. This suggests that its value should be above that of coins in worse conditions.

2. Auction History:
- The average hammer price for similar coins in the past is 20.13 euros.
- Previous hammer prices for coins with a similar condition (80) have varied, but there are examples of hammer prices in the range of 15 to 30 euros.
- The last auction with a condition of 80 had a hammer price of 20 euros.

3. Starting Price and Average Starting Price:
- The current starting price is 12 euros, which is quite low compared to the average starting price of 24.64 euros. This suggests that there is potential for the hammer price to be significantly higher.

4. Price Trends:
- In previous auctions, coins with a condition of 80 have reached hammer prices of up to 30 euros.

Based on these factors, an estimated maximum purchase price for this coin could be in the range of 25 to 30 euros, considering that the condition is good and that the price history suggests it could reach that level in an auction.

Therefore, a reasonable estimated maximum purchase price would be 30 euros.

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 75 (MS), indicating that it is in quite good shape. This suggests that its value should be in a mid-high range.

2. Previous Prices: By looking at previous auction prices for coins with a similar condition (75), we can see that they have reached hammer prices of up to 50 euros in recent auctions. For example, at the auction on December 15, 2020, a coin with a condition of 75 was sold for 30 euros, and on other occasions, it has reached up to 50 euros.

3. Average Hammer Price: The average hammer price for this coin is 44.76 euros, which also indicates that the market value is in that range.

4. Auction Trends: The coin has been auctioned 46 times, of which 33 have resulted in sales. This suggests that there is a consistent interest in this coin, which may increase its value.

5. Starting Price: The starting price is 12 euros, which is relatively low compared to previous hammer prices.

Based on these factors, an estimated maximum purchase price for the coin could be between 50 and 70 euros, considering that the condition is good and that the interest in the coin seems to be solid. However, since the starting price is 12 euros, it is likely that the hammer price will not significantly exceed the observed average range.

Therefore, a reasonable estimated maximum purchase price could be 60 euros.

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

2. Auction History:
- The average hammer price for similar coins has been 41.15 euros.
- In previous auctions, coins with a similar condition (90) have reached hammer prices that vary, but some examples are:
- 14 euros (2020-12-14)
- 30 euros (2020-10-20)
- 65 euros (2020-05-26)
- 220 euros (2020-12-17, although this coin had a condition of 100).

3. Starting Price and Estimated Prices:
- The current starting price is 12 euros, and the average starting price in the past has been 25.53 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 shown a trend of increasing, especially for coins in good condition.

Based on these factors, an estimated maximum purchase price for this coin could be between 50 and 70 euros, considering its good condition and the history of hammer prices. This would allow for competitive bidding in the auction without exceeding a reasonable limit based on historical data.

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 30 (BC+), which indicates that it is not in the best shape. This generally negatively affects its value.

2. Previous Auction Prices: By looking at previous auction prices for coins with a similar condition (30), we can see that auction prices have varied, but they have generally remained in a low range. For example, in past auctions, the hammer prices for coins with a condition of 30 have been between 12 and 15 euros.

3. Average Hammer Price: The average hammer price for this coin is 137.95 euros, but this includes coins in better conditions. Therefore, it is not a good indicator for our particular coin.

4. Recent Trends: In the most recent auctions, hammer prices for coins with a similar condition have been in the range of 12 to 20 euros.

5. Starting Price: The starting price is 12 euros, which suggests that the seller has moderate expectations.

Based on these factors, an estimated maximum purchase price for this coin, considering its condition and previous auction prices, could be in the range of 15 to 20 euros. This reflects a price that is reasonable given its state and market trends.

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 25 (BC), which indicates that it is not in very good shape. This generally reduces its value compared to coins in better condition.

2. Historical Prices: By looking at the auction prices of coins with similar conditions, we can see that the auction price for coins with a condition of 25 (BC) has been relatively low. For example, in previous auctions, the hammer prices for coins in similar conditions have ranged from 12 to 30 euros.

3. Starting Price and Average Hammer Price: The current starting price is 12 euros, and the average hammer price for similar coins is 80.88 euros. However, given that the condition of this coin is low, it is unlikely to reach the average hammer price.

4. Sales Trends: The coin has been auctioned 112 times, of which it has sold 97 times, indicating a good sales rate. However, the fact that there are 15 occasions where it did not sell suggests that there may be a limit to what buyers are willing to pay.

5. Previous Estimates: In previous auctions, the estimated price for coins with a similar condition has been around 15 to 25 euros.

Based on these factors, an estimated maximum purchase price for this coin could be between 20 and 30 euros. This reflects a balance between the current condition and the historical hammer prices for coins in similar conditions.