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

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 75.65 euros.
- In previous auctions, the coin has reached hammer prices of up to 200 euros (in the case of a condition rating of 85).
- Most auctions have had hammer prices ranging between 40 and 150 euros, depending on the condition.

3. Starting Price and Average Starting Price:
- The current starting price is 60 euros, which is slightly higher than the average starting price of 50.61 euros. This may indicate an expectation of greater interest in this auction.

4. Recent Trends: In the most recent auctions, the hammer prices have shown a range that may indicate an increase in interest for this coin.

Based on these factors, an estimated maximum purchase price could be in the range of 90 to 120 euros. This is based on the historical hammer prices for coins of similar condition and the current interest in the auction.

Therefore, a reasonable maximum purchase price could be 100 euros.