Based on the data provided, we can observe that the coin in question has had an average starting price of 46.88 euros in previous auctions, with an average closing price of 51 euros. Additionally, it has been auctioned a total of 8 times in the past, of which it has been sold 5 times.

Considering the current condition of the coin (75 - VF) and the previous auction prices, we can estimate a maximum purchase price. Given that the current starting price is 100 euros, and considering that an estimated price of up to 80 euros has been reached in previous auctions, we could consider a maximum purchase price around 90-95 euros.

It is important to note that the final auction price will depend on the demand at that specific moment, so it is advisable to monitor its evolution to adjust the offer accordingly.