Based on the data provided, we can observe that the coin in question has had a varied auction history in terms of prices and condition. Here are some key points summarized:

- Average starting price of previous auctions: 126.67 euros
- Average final price of previous auctions: 203.33 euros
- Current condition of the coin: 75 (VF)
- Estimated price of the next auction: 110 euros

Considering that the estimated price of the next auction is 110 euros and the average final price of previous auctions has been 203.33 euros, we could estimate a maximum purchase price around that range. Given that the current condition of the coin is 75 (VF), we could consider a maximum purchase price close to 200 euros.

Therefore, my recommendation would be to set a maximum purchase price around 200 euros, taking into account the price history and condition of the coin in question.