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 70 (VF-), indicating that it is in an acceptable state, but not among the best qualities. This may influence the price, as coins in better condition tend to fetch higher prices.

2. Auction History:
- The average hammer price for similar coins has been 71.94 euros.
- In previous auctions, the hammer price has varied, with a maximum of 120 euros for a coin with a condition of 80 and a minimum of 31 euros for one with a condition of 70.
- The coin has sold in 20 out of 26 auctions, indicating good demand.

3. Starting Price and Estimates:
- The current starting price is 60 euros, which is slightly higher than the average starting price of 41.72 euros.
- The estimated price for this auction is 90 euros, suggesting expectations for it to reach a higher price.

4. Price Trends:
- In recent auctions, hammer prices have shown a tendency to be above the starting price, especially for coins in similar conditions.

Based on these factors, an estimated maximum purchase price could be around 90-100 euros, considering that the estimated price is 90 euros and that in the past, hammer prices have reached up to 120 euros for coins in better condition. However, given that the condition of this coin is 70, a more conservative maximum purchase price could be approximately 90 euros.

To estimate a maximum purchase price for the coin in question, we can analyze the provided data, especially the previous auction prices and the current condition of the coin.

1. Current Condition: The coin has a condition of 75 (MBC), which is an average condition. This suggests that its value will not reach the higher prices seen in coins of better condition.

2. Previous Auction Prices:
- In previous auctions, coins with a condition of 75 have reached auction prices that vary considerably. For example:
- In 2011, a coin with a condition of 75 was auctioned for 420 euros.
- In 2013, another coin with a condition of 75 was auctioned for 250.03 euros.
- In 2014, a coin with a condition of 75 was auctioned for 821.62 euros.
- In 2015, a coin with a condition of 75 was auctioned for 400 euros.
- In 2022, a coin with a condition of 90 (better than 75) was auctioned for 270 euros.

3. Average Auction Price: The average auction price for similar coins is 212.49 euros, which can serve as a good indicator of the expected value.

4. Starting Price: The current starting price is 75 euros, indicating that the seller expects a lower price initially.

5. Auction Trends: Given that the coin has been auctioned 56 times in the past and has sold 44 times, there is good demand for this coin, which may increase its value.

### Estimation of Maximum Purchase Price:
Considering all these factors, a reasonable maximum purchase price could be in the range of 200 to 300 euros, considering that:
- The condition is 75, which limits the maximum price.
- Previous auction prices for coins with the same condition have reached up to 420 euros, but that is an exceptional case.
- The average auction price is 212.49 euros, suggesting that a purchase price around 250 euros would be competitive and reasonable.

Therefore, an estimated maximum purchase price could be approximately 250 euros.