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

1. Current Condition: The coin has a condition of 75 (VF), which is quite good, but not the best. This can influence the price, as coins in better condition tend to reach higher prices.

2. Auction History:
- In 2022, the coin was auctioned with a starting price of 250 euros and sold for 200 euros, indicating that interest in that auction was moderate.
- In 2024, the same coin with a condition of 80 (better than the current one) had a starting price of 200 euros and sold for 480 euros, showing that there is potential for price increase depending on the condition.

3. Average Hammer Price: The average hammer price for similar coins is 320 euros, which can serve as a reference for establishing a maximum price.

4. Current Starting Price: The starting price is 150 euros, suggesting that the seller is initially looking for a lower price, but this does not necessarily reflect the true value of the coin.

Taking these factors into account, an estimated maximum purchase price could be positioned between the average hammer price and the highest observed hammer price. Given that the current condition is 75, and considering the average hammer price of 320 euros, a reasonable maximum price could be:

Estimated Maximum Purchase Price: 300 euros.

This price reflects a balance between the current condition and historical interest in the coin.