Based on the data provided, we can observe that the coin in question has performed well in previous auctions, with final prices exceeding the starting price in most cases. Additionally, the coin's condition is rated at 75 (MBC), which is positive but does not reach the highest level of preservation.

Considering that the average auction price has been 43.4 euros and the coin's condition is 75 (MBC), we could estimate a maximum purchase price around 50-55 euros. However, please note that this is just an estimate and the final price may vary depending on factors such as demand at the auction and buyers' willingness to bid on the coin.