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

1. Current Condition: The coin has a condition rating of 75 (VF), indicating that it is in an acceptable state, but not among the best qualities.

2. Auction History:
- The average hammer price for similar coins in the past has been 135.8 euros.
- Previous auctions of coins with a similar condition (75) have had hammer prices that vary, but some examples are:
- 99.9 euros (2013)
- 115 euros (2013)
- 96.51 euros (2015)
- 85 euros (2023)

3. Starting Price and Average Starting Price:
- The current starting price is 65 euros, and the average starting price for similar coins is 80.52 euros.

4. Price Trends:
- Observing the hammer prices of coins with similar conditions, it seems that the hammer price range for coins in VF condition may be between 80 and 130 euros, depending on demand and other market factors.

Based on this data, an estimated maximum purchase price for this coin could be in the range of 120 to 150 euros. This is based on the auction price history and the current condition of the coin. However, it is important to consider that the final price may vary depending on competition in the auction and the interest of collectors.