Based on the data provided, we can observe that the coin in question had a starting price in the current auction of 30 euros, with a conservation grade of 70 (MBC-). Additionally, it has been auctioned in the past on several occasions, with closing prices ranging between 23 and 190 euros.

The average starting price of previous auctions has been 44.18 euros, while the average closing price has been 71.87 euros. The coin has been sold in 88% of the previous auctions.

Taking into consideration these data, as well as the current conservation grade of the coin and previous closing prices, we could estimate a maximum purchase price around 80-90 euros. Since the highest closing price was 190 euros in the past, and considering the upward trend in closing prices, a maximum purchase price in that range could be a prudent estimation.