Based on the data provided, we can observe that the coin in question has had an average auction price of 110.29 euros in previous auctions. Additionally, its condition is described as '30 (BC+)'.

Considering that the coin's condition is relatively good and the average auction price has been 110.29 euros, we could estimate a maximum purchase price around that value or slightly higher, taking into account that the starting price this time is 60 euros.

Therefore, an estimated maximum purchase price for this coin in the next auction could be around 120-130 euros, considering the trend of previous prices and the condition of the coin.