Based on the data provided, we can observe that the coin in question has had an average starting price of 77.78 euros in previous auctions, with an average closing price of 122.89 euros. The condition of this coin is described as 'BC+' (30).

When analyzing the previous prices of this coin in past auctions, we can see that it has had significant variations in its starting, estimated, and closing prices. However, the highest price reached was 550 euros in an auction held in 2019.

Given that the coin has been auctioned 9 times in the past and has been sold on all those occasions, we can consider that it has a stable demand in the collectors' market.

Taking into account all these data, and considering the condition of the coin, the estimated maximum purchase price for this coin in the next auction could be around 150-200 euros. It is important to note that the final price will depend on factors such as competition in the auction and the interest of potential buyers at that specific moment.