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 70 (VF-). This is an important factor, as coins in better condition tend to reach higher prices.

2. Auction History:
- The average hammer price for similar coins has been 70.15 euros.
- In previous auctions, we have seen hammer prices that varied significantly, from 40 euros to 500 euros, depending on the condition and demand at that time.
- The last auction for this coin had a hammer price of 130 euros with a condition of 85, indicating that there is an active market willing to pay higher prices for coins in better condition.

3. Starting Price and Average Starting Price:
- The current starting price is 40 euros, and the average starting price has been 50 euros. This suggests that the starting price is reasonable, but there may be room for a higher hammer price.

4. Sales Trends: The coin has been sold in 40 out of 49 auctions, indicating a good sales rate and consistent interest in this reference.

Based on these factors, an estimated maximum purchase price could be in the range of 80 to 100 euros. This is based on the hammer price history and the current condition of the coin. If demand is high at the auction, it could even reach a higher price, but 100 euros seems like a reasonable limit considering the available information.