Based on the provided data, we can observe that the coin in question has had an average starting price of 70.1 euros and an average final price of 75.22 euros in previous auctions. Additionally, it has been auctioned a total of 21 times in the past, being sold 10 times and not sold 11 times.

The coin's condition is described as 70 (F-VF), indicating a medium to low conservation state. However, in previous auctions, estimated prices have ranged from 20 euros to 250 euros, depending on the date and conservation conditions.

Given that the coin will be auctioned soon and considering the historical data from previous auctions, as well as the starting price and the current estimated price of 100 euros, we could estimate a maximum purchase price around 150-170 euros, taking into account the medium to low conservation state of the coin and the prices reached in previous auctions.

It is important to note that the final auction price will depend on various factors, such as demand at the time of the auction, competition from other bidders, and buyers' perception of the coin's value at that specific moment.