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

1. Current Condition: The coin has a condition of 70 (MS-). 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 is 226.91 euros.
- In the past, coins with similar conditions (around 70) have had hammer prices that varied, but some examples are:
- A coin with a condition of 80 was sold for 120 euros (2020-10-20).
- Another coin with a condition of 80 was sold for 130 euros (2020-05-26).
- A coin with a condition of 90 was sold for 110 euros (2019-10-17).
- A coin with a condition of 95 was sold for 290 euros (2020-12-16).

3. Starting Price and Average Starting Price:
- The current starting price is 60 euros, which is relatively low compared to the average starting price of 104.74 euros.

4. Sales Trends:
- Of the 61 times this coin has been auctioned, it has sold 57 times, indicating good demand.

5. Condition-Based Estimation:
- Given that the condition is 70, a reasonable hammer price could be in the range of 100 to 150 euros, considering that coins with higher conditions have reached significantly higher prices.

### Final Estimation
Taking all these factors into account, an estimated maximum purchase price for this coin could be between 120 and 150 euros. This is based on the hammer price history for coins with similar conditions and the current market context.