Based on the provided data, we can observe that the coin in question has had an average auction closing price of 130.14 euros in previous auctions. Additionally, its current condition is estimated at 30 (BC+).

Considering that the starting price for the upcoming auction is 60 euros and the historical average starting price is 96.19 euros, we can infer that the closing price could be in a similar range to the previous average closing price.

Given that the coin's condition is 30 (BC+), and taking into account the previous prices of similar auctions as well as the current estimated price of 150 euros, we could estimate a maximum purchase price around 140-150 euros.

It is important to note that the final closing price may vary depending on the demand at the auction and other factors that may influence the decision of potential buyers.