To estimate a maximum purchase price for the coin in question, we can consider several factors:

1. Current Condition: The coin has a condition of 70 (MBC-). This is an important factor, as coins in better condition tend to reach higher prices.

2. Auction History:
- The average hammer price for similar coins has been 194.12 euros.
- In previous auctions, coins with a similar condition (70) have had hammer prices that varied, but some examples are:
- 80 euros hammer price in 2018.
- 150 euros hammer price in 2020.
- 170 euros hammer price in 2016.

3. Starting Price: The starting price is 80 euros, indicating that the seller expects a minimum of 80 euros, but the hammer price could be significantly higher.

4. Price Trends: Observing previous hammer prices, it seems there is a trend for coins with similar conditions to sell between 150 and 200 euros, depending on demand and other market factors.

5. Average Starting and Hammer Prices: The average starting price of 114.26 euros and the average hammer price of 194.12 euros suggest that there is a considerable margin between what is expected and what is actually paid.

Based on these factors, an estimated maximum purchase price for this coin could be around 180-200 euros, considering that the condition is good and there is a history of hammer prices that supports this estimate. However, it is important to keep in mind that the final price may vary depending on competition in the auction and the interest of collectors.