Based on the data provided, we can observe that the coin in question had a starting price of 60 euros in the most recent auction, with a conservation value of 30 (BC+). Additionally, it has been auctioned a total of 89 times in the past, out of which it was sold 83 times.

The average starting price of previous auctions has been 62.36 euros, while the average closing price has been 99.91 euros. Regarding the previous prices of this coin, we can see that they have ranged from 25 euros to 150 euros, with different price estimates and conservation values.

Given that the coin will be auctioned soon and considering the provided information, as well as the trend of previous prices, we could estimate a maximum purchase price around 120-130 euros. It is important to consider that the conservation value of the coin may influence its final price, so it is advisable to take this aspect into account when making the estimation.