To estimate a maximum purchase price for the coin in question, we can consider several factors:

1. Starting price: 125 euros.
2. Average hammer price: 200 euros. This is an important figure, as it indicates the average price at which it has sold in the past.
3. Condition: The coin has a condition rating of 70 (VF-), which indicates that it is in fairly good shape, although not the best possible condition.
4. Auction history: It has been auctioned once and sold on that occasion, suggesting that there is interest in the coin.

Given that the average hammer price is significantly higher than the starting price, and considering the good condition of the coin, an estimated maximum purchase price could be positioned between the average hammer price and an additional percentage that reflects demand and condition.

We could estimate a maximum purchase price around 220-250 euros, taking into account that the average hammer price is 200 euros and that the condition is good. This also allows for a margin for competition in the auction.

Therefore, an estimated maximum purchase price could be approximately 240 euros.