Based on the data provided, we can observe that the coin in question has had an average auction price of 20.17 euros in the past. Additionally, its current condition is 95 (UNC-).

Considering that the coin has been auctioned 84 times in the past and sold 66 times, we can infer that there is considerable interest in this coin among collectors.

Given that the average auction price has been 20.17 euros and considering the condition of 95, as well as the historical demand for the coin, we could estimate a maximum purchase price around 25-30 euros. This price range could be considered as competitive and reasonable for acquiring the coin in the next auction.