Based on the provided data, we can observe that the coin in question has had a starting price in this auction of 12 euros, with a conservation grade of 30 (BC+). Additionally, it has been auctioned in the past on several occasions, with varying starting and final prices.

The average starting price of this coin in previous auctions has been 35.13 euros, while the average final price has been 82.33 euros. The coin has been sold in 12 out of the 16 previous auctions.

Some previous prices of this coin include a starting price of 6 euros with an estimated price of 9 euros and a final price of 20 euros, with a conservation grade of 70 (FDC). Another example is an auction with a starting price of 80 euros, an estimated price of 150 euros, and a final price of 220 euros, with an unspecified conservation grade.

Given that the coin has been sold in the past and has had final prices higher than the current starting price, we could estimate a maximum purchase price around 100 euros, considering the conservation grade of 30 (BC+). However, please note that the final price may vary depending on the demand at the auction and other factors that may influence buyers' decisions.