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 indicates that it is in an acceptable state, but not of the highest quality.

2. Previous Auction Prices: By observing previous auction prices for coins with similar conditions (around 70), we can see that auction prices have varied. For example, in recent auctions, coins with a condition of 70 have reached hammer prices of around 75 to 110 euros.

3. Average Hammer Price: The average hammer price for this coin is 113.46 euros, suggesting that, in general, buyers are willing to pay more than the starting price.

4. Auction Trends: The coin has been auctioned 118 times, of which 103 have been successful sales. This indicates good demand and consistent interest in the coin.

5. Starting Price: The starting price is 50 euros, which is relatively low compared to previous hammer prices.

Based on these factors, an estimated maximum purchase price could be in the range of 100 to 130 euros, considering that the condition is 70 and that interest in the coin is high. This aligns with previous hammer prices and the average hammer price.

Therefore, an estimated maximum purchase price could be 120 euros.