Based on the provided data, we can observe that the coin in question had a starting price of 45 euros in the most recent auction, with a conservation value of 70 (MBC-). Additionally, it has been auctioned several times in the past, with final prices ranging between 45 and 300 euros.

The average starting price of this coin has been 89.44 euros, while the average final price has been 147.5 euros. In previous auctions, the estimated price has varied between 40 and 400 euros, depending on the date and conservation conditions.

Taking into consideration this data, as well as the price and conservation history of the coin, and considering the current conservation value of 70 (MBC-), my estimate for a maximum purchase price would be around 150-200 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 willingness of buyers to bid on this particular coin.