Based on the information provided, we have a coin with a conservation grade of 30 (BC+), with a starting price at auction of 45 euros. Since this coin has not been auctioned or sold in the past, we do not have historical pricing data.

Given that the conservation grade of the coin is relatively low (BC+), and considering its starting price of 45 euros, we could estimate a maximum purchase price around 35-40 euros. It is important to note that without historical sales data, this estimation is based on the conservation grade and the starting price of the coin in this particular auction.