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

1. Current Condition: The coin has a condition of 75 (VF), which indicates that it is in an acceptable state, but not of high quality. This generally affects the price, as coins in better condition tend to reach higher prices.

2. Auction History:
- The average hammer price for similar coins has been 162.93 euros.
- In previous auctions, coins with similar conditions (80 and 85) have reached hammer prices that varied, but some examples are:
- A coin with a condition of 80 sold for 10 euros (2020-05-26).
- Another with a condition of 85 sold for 190 euros (2018-10-17).
- A coin with a condition of 95 sold for 800 euros (2023-03-16), indicating that coins in better condition can reach significantly higher prices.

3. Starting Price and Average Starting Price: The current starting price is 15 euros, and the average starting price for similar coins is 93.96 euros. This suggests that the starting price is relatively low compared to the average.

4. Sales Trends: The coin has been auctioned 52 times, with an 86.5% sell-through rate (45 out of 52). This indicates a consistent interest in this coin.

Based on these factors, an estimated maximum purchase price could be in the range of 150 to 250 euros, considering that the condition is a limiting factor and that the average hammer price is 162.93 euros. Therefore, a reasonable maximum purchase price could be 200 euros.