Based on the provided data, we can observe that the coin in question has had a starting price in the current auction of 15 euros, with a conservation grade of 70 (MBC-). Additionally, it has been auctioned in the past 24 times, sold in 22 instances, and not sold in 2 instances.

The average starting price in previous auctions has been 29.88 euros, while the average final price has been 51.76 euros. Regarding previous prices of this coin, we can see that it has had variations in its starting, estimated, and final prices over the years, with conservation grades ranging from 30 to 90.

Given that the current conservation grade of the coin is 70 (MBC-), and considering that in previous auctions it has reached final prices of up to 150 euros with a conservation grade of 90, we could estimate a maximum purchase price for this coin around 120-130 euros, considering the price and conservation history.

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.