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 for similar coins has been 147.23 euros.
- In the past, hammer prices have varied significantly, ranging from 35.05 euros to 890.78 euros, depending on the condition and other factors.

3. Recent Starting and Hammer Prices:
- The current starting price is 40 euros, which is relatively low compared to the average hammer price.
- In previous auctions, coins with a similar condition (75) have reached hammer prices of up to 150 euros.

4. Recent Trends:
- In the most recent auctions, hammer prices for coins with a condition of 80 have been around 110-160 euros, suggesting that there is an active market and prices may be on the rise.

Based on these factors, an estimated maximum purchase price for the coin in question could be between 120 and 150 euros. This is based on the historical hammer prices for coins of similar condition and the current market interest.

Therefore, a reasonable maximum purchase price could be 150 euros.