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

1. Starting Price: 70 euros. This is the initial price of the auction.
2. Condition: The coin has a condition rating of 75 (MBC), indicating that it is in quite good shape.
3. Auction History: It has been auctioned 2 times in the past, of which it has sold 1 time. This suggests that there is interest in the coin, although it also indicates that it has not always sold.
4. Average Starting Price: 95 euros. This suggests that, in general, coins of this reference tend to have a higher starting price.
5. Previous Prices: In the previous auction, the starting price was 120 euros, although there is no information on the final price.

Given that the current starting price is 70 euros, which is lower than the average starting price and the previous starting price, and considering the good condition of the coin, it can be estimated that the final price could be in a higher range.

Taking all these factors into account, an estimated maximum purchase price could be between 100 and 120 euros, since the starting price is low compared to the auction history and the condition rating.

Therefore, a reasonable maximum purchase price could be 110 euros.