Based on the data provided, we can observe that the coin in question has had a starting price in the current auction of 30 euros, with a conservation grade of 30 (BC+). Additionally, it has been auctioned in the past on several occasions, with closing prices ranging between 40 and 900 euros.

The average starting price of previous auctions has been 77.69 euros, while the average closing price has been 216.86 euros. The coin has been sold in 93.33% of previous auctions.

Considering the previous prices of the coin and its current conservation, as well as the fact that it will be auctioned in the coming days, we could estimate a maximum purchase price around 150-180 euros. Given that the highest closing price was 900 euros in the past, and taking into account the current conservation and previous prices, a range of 150-180 euros seems reasonable as the estimated maximum purchase price in this auction.