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 of 70 (VF-), indicating that it is in relatively good shape, but not the best possible condition.

2. Historical Prices: Looking at the hammer prices of coins with similar conditions (70 and 80), we can see that:
- In previous auctions, coins with a condition of 70 have reached hammer prices of up to 85 euros.
- Coins with a condition of 80 have had hammer prices that vary, but some have reached 240 euros.

3. Average Hammer Price: The average hammer price for this coin is 184.95 euros, suggesting that, in general, coins of this reference tend to sell for relatively high prices.

4. Recent Trends: In the most recent auction, a coin with a condition of 80 sold for 240 euros, indicating that there is a growing interest in coins of good condition.

5. Starting Price: The starting price is 10 euros, which is quite low compared to previous hammer prices.

Taking all these factors into account, 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 based on the fact that, although the condition is not the highest, the interest in the coin and previous hammer prices suggest that it could reach a higher price than the average hammer price for similar conditions.

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