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-). This is an important factor, as coins in better condition tend to reach higher prices.

2. Starting Price and Average Hammer Price: The starting price is 70 euros, and the average hammer price in previous auctions is 114.22 euros. This suggests that, on average, similar coins have sold for a significantly higher price than their starting price.

3. Sales History: The coin has been auctioned 30 times, of which 24 have resulted in sales. This indicates good demand and consistent interest in this reference.

4. Previous Prices: Looking at previous hammer prices for coins with similar conditions, we can see that they have reached prices of up to 340 euros in the case of a condition of 80. However, most hammer prices for conditions between 70 and 75 have been in the range of 55 to 150 euros.

5. Recent Trends: In the most recent auctions, hammer prices have varied, but there are examples of coins with similar conditions that have reached hammer prices of 95 to 150 euros.

Based on these factors, an estimated maximum purchase price for the coin in question could be in the range of 120 to 150 euros. This range takes into account the current condition, the sales history, and the price trends in recent auctions.