Based on the data provided, we can observe that the coin in question has performed well in previous auctions, with final prices greatly exceeding the starting and estimated prices. Additionally, the coin's preservation has remained at a high level, with a grade of 100 (S/C).

The average final auction price of the coin in previous auctions has been 41.64 euros, while the average starting price has been 20.33 euros. However, the highest price reached in a previous auction was 110 euros.

Given the coin's excellent preservation and considering the history of previous final prices, as well as the highest price reached, we could estimate a maximum purchase price of around 120 euros for this coin in the next auction. This takes into account the high demand and the good performance it has had in previous auctions.