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 (MS-). This indicates that it is in an acceptable state, but not of high quality.

2. Previous Auction Prices: By observing previous auction prices for coins with a similar condition (70), we can see that they have varied. For example:
- In previous auctions, coins with a condition of 70 have reached hammer prices of 110 to 140 euros.
- The average hammer price for coins with a condition of 70 seems to be around 110-135 euros.

3. Starting Price and Average Hammer Price: The current starting price is 110 euros, and the average hammer price in the past has been 133.28 euros. This suggests that the hammer price could be in a similar range or slightly above the starting price.

4. Recent Trends: In the most recent auctions, hammer prices for coins with similar conditions have shown a trend of stabilizing or slightly increasing, which could indicate growing interest in this type of coin.

Based on these points, an estimated maximum purchase price for the coin in question could be in the range of 140 to 160 euros. This range takes into account the current condition, previous hammer prices, and market trends. However, it is important to note that the final price may vary depending on competition in the auction and the interest of collectors.