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-), indicating that it is in an acceptable state, but not among the best qualities.

2. Auction History:
- The average hammer price for similar coins has been 76.12 euros.
- In the past, coins with a similar condition (70) have reached hammer prices that varied, with examples where they have sold for 66 euros and 70 euros in recent auctions.

3. Starting Price and Average Starting Price:
- The current starting price is 35 euros, and the average starting price in the past has been 38.42 euros.

4. Sales Trends:
- Out of the 56 times this coin has been auctioned, it has sold 44 times, indicating a good sales rate.

5. Previous Prices:
- In previous auctions, the hammer price has ranged from 35 to 141 euros, depending on the condition and other factors.

Based on this data, an estimated maximum purchase price could be set in a range between 70 and 90 euros. This is because, although the condition is good, it is not excellent, and the price history suggests it could reach a higher price, but not necessarily the maximum from previous auctions.

Therefore, a reasonable estimated maximum purchase price could be 80 euros.