Based on the data provided, we can observe that the coin in question has a starting price of 30 euros and is in a conservation grade of 70 (MBC-). Additionally, it has been auctioned three times in the past, with average auction prices of 101.33 euros.

Previous auction prices of this same coin are also provided, where it is noted that in the last auction held in 2020, the coin was sold for 84 euros with an estimated price of 65 euros.

Taking into consideration this data, as well as the history of previous prices, we can estimate a maximum purchase price for this coin in the upcoming auction. Given that the average auction price has been 101.33 euros and the coin is in a conservation grade of 70 (MBC-), we could consider a maximum estimated purchase price around 110-120 euros. This is considering that the starting price is 30 euros and it was sold for 84 euros in the last auction, so it is likely that the auction price in the next auction will be in a similar or slightly higher range.