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 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 this coin in the past has been 132.58 euros.
- Hammer prices of up to 438.33 euros have been recorded for coins in superior conditions (107).
- In similar conditions (75 and 80), hammer prices have ranged between 55 and 140 euros.

3. Starting Price: The current starting price is 35 euros, indicating that the auctioneer expects moderate interest in the coin.

4. Recent Trends: In the most recent auctions, hammer prices have been in the range of 70 to 110 euros for conditions of 75 and 80.

Based on this data, an estimated maximum purchase price for the coin with a condition of 70 could be in the range of 80 to 120 euros. This is because, although the condition is not the highest, there is a price history suggesting it could reach a reasonable price at auction.

Therefore, an estimated maximum purchase price could be 100 euros. This allows for some competition in the auction, considering that the average hammer price is 132.58 euros, but adjusted for the current condition.