To estimate a maximum purchase price for the coin in question, we will consider several factors:

1. Starting Price: 75 euros. This is the initial price of the auction.
2. Condition: The coin has a condition rating of 70 (VF-), indicating that it is in acceptable but not excellent condition. This may affect its value compared to coins in better condition.
3. Auction History: The coin has been auctioned 3 times in the past, of which it has sold 2 times. This suggests that there is interest in the coin, although there is also one instance where it did not sell.
4. Previous Prices: In previous auctions, the starting price was 120 euros and the final price was 130 euros. This indicates that, despite a higher starting price, buyer interest translated into a final price that was not significantly higher than the starting price.

Given that the average final price in the past has been 130 euros and considering the condition of the coin, an estimated maximum purchase price could be positioned between the starting price and the average final price.

Taking all these factors into account, an estimated maximum purchase price could be approximately 100-110 euros. This reflects moderate interest, given the auction history and the condition of the coin.