Based on the data provided, we can observe that the coin in question has had an average auction closing price of 171.76 euros in previous auctions. Additionally, its condition has been described as '70 (MBC-)'.

Considering that the coin's condition is relatively good and the average auction closing price has been 171.76 euros, we could estimate a maximum purchase price around 190-200 euros. Given that the starting price in the upcoming auction is 200 euros, this estimated price range seems reasonable.

It is important to note that the final auction price may vary depending on factors such as demand at that specific time, competition from other bidders, and interest in the coin in question.