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

1. Current Condition: The coin has a condition rating of 75 (VF), indicating that it is in fairly good shape, although not the best possible condition.

2. Auction History:
- The average hammer price for coins of this reference is 5,950 euros.
- Previous hammer prices have varied, but there are examples of auctions reaching up to 26,000 euros in similar conditions (condition rating of 85).
- The trend shows that as the condition improves, the hammer price also tends to increase.

3. Starting Price and Average Starting Price:
- The current starting price is 2,000 euros, which is slightly higher than the average starting price of 1,912.5 euros.

4. Comparison with Previous Prices:
- In previous auctions, hammer prices have varied significantly, but overall, hammer prices have exceeded the starting price.

Given that the coin's condition is 75 (VF), which is lower than the higher conditions that have reached significant hammer prices, but still an acceptable state, we can estimate a maximum purchase price.

Considering all these factors, an estimated maximum purchase price could be around 4,000-5,000 euros. This is based on the fact that, although the condition is not the best, the auction price history and potential demand could justify a price in that range.