Based on the data provided, we can observe that the coin has had an average auction closing price of 37.33 euros in previous auctions. Additionally, its current condition is 25 (BC).

Considering that the coin will be auctioned in the coming days with a starting price of 30 euros and has had an estimated price in previous auctions ranging between 9 and 70 euros, we can estimate a maximum purchase price based on the price history and condition of the coin.

Given that the coin has had closing prices higher than its starting price in previous auctions, and considering its current condition, we could estimate a maximum purchase price around 50-60 euros. It is important to note that the final price will depend on the demand at the auction and other potential buyers interested in the coin.