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 is an important factor, as coins in better condition tend to fetch higher prices.

2. Starting Price and Average Hammer Price: The starting price is 80 euros, and the average hammer price in previous auctions is 110.93 euros. This suggests that, in general, coins of this reference tend to sell for above their starting price.

3. Sales History: The coin has been auctioned 33 times, of which it has sold 30 times. This indicates good demand and a history of successful sales.

4. Previous Prices: Looking at previous hammer prices for coins with a similar condition (70), we see that they have reached hammer prices of up to 260 euros in a recent auction (2023-01-31). However, there are also lower prices, such as 70 euros in other auctions.

5. Price Trends: The average hammer price of 110.93 euros and the estimated price of 200 euros in previous auctions suggest that there is significant potential for the coin to reach a higher price.

Based on these factors, an estimated maximum purchase price could be in the range of 150 to 200 euros, considering that the condition is good and there is a history of hammer prices that supports this estimate. Therefore, a reasonable maximum purchase price could be 180 euros.