Based on the data provided, we can observe that the coin in question has had an average starting price of 43.22 euros in previous auctions, with an average closing price of 52.27 euros. Additionally, the condition of the coin has been described as 70 (VF+), indicating a fairly acceptable condition.

Taking into account the previous prices of the coin in past auctions, as well as its condition and the fact that it has been auctioned 37 times, we can estimate a maximum purchase price around 70-75 euros. Given that the average closing price has been 52.27 euros, and considering the condition and demand for this coin, an estimated maximum purchase price of 70-75 euros seems reasonable.

Therefore, my recommendation would be to consider a maximum purchase price of around 70-75 euros for this coin in the next auction.