Based on the data provided, we can observe that the coin in question has had an average auction closing price of 130.92 euros in previous auctions. Additionally, the condition of the coin has been described as '70 (MBC-)', indicating that it is in a fairly acceptable condition.

Considering that the starting price for the next auction is 80 euros and the historical average starting price is 94.4 euros, we could estimate a maximum purchase price around 140 euros, which is a value similar to the estimated price in previous auctions.

Given that the coin has sold in every previous auction it has been listed in, and considering its condition and historical prices, an estimated maximum purchase price of around 140 euros seems reasonable. However, it is important to note that the final price may vary depending on demand at the auction and other external factors.