Based on the provided data, we can observe that the coin in question had a starting price of 45 euros in the last auction, with an estimated price of 50 euros and a final price of 51 euros. The condition of the coin has been classified as 70 (MBC-).

Additionally, information about previous auctions of the same coin is provided, where the starting, estimated, and final prices have varied. The highest price reached in a previous auction was 700 euros, with an estimated price of 400 euros and a final price of 650 euros, with a condition of 95.

Taking into account this data, as well as the history of previous auctions and the current condition of the coin, we could estimate a maximum purchase price around 60-70 euros. It is important to note that the final price may vary depending on factors such as demand at the time of the auction and the interest of potential buyers.