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

2. Previous Prices: By looking at previous auction prices for coins with a similar condition (70), we can see that they have reached varying hammer prices. For example, in past auctions, coins with a condition of 70 have reached hammer prices of up to 100 euros.

3. Average Hammer Price: The average hammer price for this coin is 73.25 euros, which gives us a good reference for what buyers are willing to pay.

4. Auction Trends: The coin has been auctioned 119 times, of which 106 have been sold. This indicates a consistent interest in the coin, which can influence its price.

5. Starting Price: The starting price is 40 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 90 to 110 euros, considering that the condition is good and there is a history of hammer prices that supports this estimate.

Therefore, a reasonable estimated maximum purchase price for this coin could be 100 euros.