Based on the data provided, we can observe that the coin in question had a starting price of 25 euros in the most recent auction, with a conservation value of 70 (MBC-). Additionally, it has been auctioned a total of 29 times in the past, being sold in 21 occasions and not sold in 8 occasions.

The average starting price of previous auctions has been 18.73 euros, while the average final price has been 26.3 euros. Regarding the previous prices of this coin, we can see that it has had variations in its starting, estimated, and final values throughout past auctions.

Taking all of these data into consideration, and considering that the coin will be auctioned soon, we could estimate a maximum purchase price around 30-35 euros, taking into account the price history and the conservation of the coin. It is important to note that the final auction price may vary depending on the demand at the auction and other factors that may influence the final bid.