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 fairly good shape, but not the best possible condition.

2. Auction History:
- The average hammer price in the past has been 35.38 euros.
- The average starting price has been 36.73 euros.
- Coins with the same condition (75) have been auctioned in the past, and hammer prices have varied, with examples around 29.03 euros and 38 euros.

3. Recent Starting and Hammer Prices: In the most recent auctions, starting prices have ranged from 20 to 100 euros, with hammer prices reaching up to 110 euros for coins in better condition.

4. Market Trends: Given that the coin has been auctioned 69 times and has a 52% sell-through rate, this suggests there is moderate interest in this coin.

Based on these factors, an estimated maximum purchase price could be in the range of 50 to 70 euros. This is because the starting price is 50 euros, and considering the auction history and current condition, a price of up to 70 euros could be reasonable for a buyer looking to secure the coin in a VF condition.

Therefore, the estimated maximum purchase price would be 70 euros.