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

1. Current starting price: 50 euros.
2. Coin condition: 70 (MBC-), indicating an acceptable but not excellent condition.
3. Auction history:
- It has been auctioned 4 times in the past, of which it has sold 3 times.
- The average starting price in previous auctions was 91.32 euros, and the average hammer price was 163.89 euros.
- Previous hammer prices were 160 euros (2012), 262.73 euros (2013), and 68.93 euros (2015).

4. Price trends:
- The highest hammer price was 262.73 euros, but this corresponds to a condition of 90, which is significantly better than the current condition of 70.
- The lowest hammer price was 68.93 euros, which corresponds to a condition of 75.

Given that the current condition of the coin is 70, which is lower than the conditions of previous auctions, it is reasonable to adjust the expected hammer price downward. However, the starting price of 50 euros is quite low compared to previous hammer prices.

Estimated maximum purchase price:
- Considering the average hammer price of 163.89 euros and adjusting for condition, a reasonable maximum purchase price could be in the range of 80 to 120 euros. This is based on the idea that, although the condition is not the best, the interest in the coin and its auction history suggest it could reach a higher price than the starting price.

Therefore, an estimated maximum purchase price could be 100 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 70 (VF-). This is an important factor, as coins in better condition tend to reach higher prices.

2. Auction History:
- The average hammer price for similar coins has been 305.15 euros.
- In the past, coins with similar conditions (around 70-75) have been auctioned and reached hammer prices that varied, but some examples are:
- 2013-04-19: 164.51 euros (condition 75)
- 2013-06-15: 64.72 euros (condition 75)
- 2022-06-09: Not sold, but the condition was 70.
- 2022-07-07: 360 euros (condition 80)
- 2023-03-01: 230 euros (condition 85)

3. Starting Price: The starting price is 200 euros, indicating that the seller expects a minimum of 200 euros.

4. Price Trends: Observing the hammer prices of coins with similar conditions, it seems that the price range can vary quite a bit, but there are examples of coins that have reached hammer prices above 300 euros.

Based on these factors, an estimated maximum purchase price could be in the range of 250 to 350 euros, considering that the condition is slightly lower than that of some coins that have reached higher prices, but still, the auction history suggests there may be interest in paying a reasonable price for a coin in VF- condition.

Therefore, an estimated maximum purchase price could be approximately 300 euros.

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 90 (EF), 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 this coin in the past is 188.08 euros.
- The highest hammer prices in previous auctions for coins with similar conditions (around 80-90) have been up to 490 euros (in 2017) and 320 euros (in 2020).

3. Starting Price and Average Starting Price:
- The current starting price is 150 euros, which is lower than the historical average hammer price. This suggests that there may be room for the hammer price to be higher.

4. Recent Trends: In the most recent auctions, hammer prices have varied, but overall, they have been in a range that suggests demand for this coin remains strong.

Based on these factors, an estimated maximum purchase price could be in the range of 250 to 300 euros, considering that the condition is good and that the price history shows similar coins have reached higher prices in the past.

Therefore, a reasonable maximum purchase price could be 300 euros.

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 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 this coin in the past has been 163.52 euros.
- The highest hammer prices have reached up to 953.96 euros in condition ratings of 90.
- In recent auctions, the hammer price has varied, but it has remained in a range that suggests consistent demand for this coin.

3. Starting Price and Average Starting Price:
- The current starting price is 75 euros, which is below the average starting price of 101.06 euros. This may indicate a buying opportunity, as the starting price is lower than the historical average.

4. Recent Trends: In the last auction, the coin sold for 100 euros with an estimated price of 160 euros, suggesting that there is interest in the coin at higher prices.

Based on these factors, an estimated maximum purchase price could be in the range of 150 to 200 euros, considering that the condition is good and that the price history shows that coins in similar conditions have reached higher prices.

Therefore, a reasonable maximum purchase price could be 200 euros.