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 quite good shape. This may positively influence its price.

2. Auction History:
- In the past, this coin has been auctioned 4 times, of which it has sold 3 times. This suggests that there is interest in the coin.
- The average starting price in previous auctions is 100 euros, and the average hammer price is 114 euros. This indicates that, in general, buyers are willing to pay around 114 euros for coins of this reference.

3. Previous Prices:
- In the 2018 auction, the coin sold for 110 euros with a condition of 80.
- In 2020, the hammer price was 32 euros, but the starting price was 30 euros, indicating that there was not much interest on that occasion.
- In 2018 and 2017, the starting prices were significantly higher, but they also reflect stronger interest at those times.

4. Current Starting Price: The starting price is 35 euros, which is relatively low compared to the average hammer price.

Given that the coin's condition is 75 (VF) and considering the price history, an estimated maximum purchase price could be positioned in a range between the average hammer price (114 euros) and a bit lower due to the current condition.

Maximum Purchase Estimate: It could be reasonable to estimate a maximum purchase price of around 100-110 euros, taking into account the condition and historical interest in the coin.