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

1. Current Condition: The coin has a condition rating of 75 (VF), indicating that it is in acceptable shape, but not among the best qualities. This generally affects the price, as coins in better condition tend to fetch higher prices.

2. Auction History:
- The average starting price for similar coins is 431.78 euros, and the average final price is 794.17 euros.
- In the past, this coin has had final prices that varied significantly, ranging from 198.87 euros to 2898.01 euros, depending on the condition and other factors.

3. Price Trends:
- The last auction for this coin in 2023 had a final price of 700 euros with a condition rating of 80, suggesting that interest in this coin remains strong.
- The highest recorded auction was for 2898.01 euros, but that was for a coin in better condition (condition rating of 90).

4. Current Starting Price: The starting price is 100 euros, which may attract more bidders, but the final hammer price will depend on the competition in the auction.

Taking all these factors into account, an estimated maximum purchase price for this coin, considering its condition and price history, could be in the range of 600 to 800 euros. This is based on the average final price and recent interest in similar coins.