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 indicates that it is in an acceptable state, but not of the highest quality.

2. Auction History:
- The average hammer price for this coin is 113.46 euros.
- In previous auctions, hammer prices have varied, with some reaching up to 850 euros in exceptional conditions (such as a condition rating of 95).
- Most hammer prices for similar conditions (70-80) have been in the range of 50 to 150 euros.

3. Starting Price: The starting price is 50 euros, which can be a good starting point for the auction.

4. Recent Trends: In the most recent auctions, hammer prices for coins with similar conditions have been around 75-110 euros.

Based on these factors, an estimated maximum purchase price for this coin, considering its condition and price history, could be in the range of 100 to 130 euros. This allows for some margin for competition in the auction, as buyers may be willing to pay a little more for a coin in this state.