To estimate a maximum purchase price for the coin in question, we can analyze the provided data and consider 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. Previous Auction Prices:
- The coin has been auctioned 10 times and has sold on all occasions.
- The average hammer price in previous auctions is 161 euros.
- The previous hammer prices for coins with a similar condition (70) have been 160 euros (2020) and 150 euros (2014).

3. Starting Price and Average Starting Price:
- The current starting price is 150 euros, which is slightly higher than the average starting price of 132.27 euros.

4. Price Trends:
- In previous auctions, hammer prices have varied, but generally, coins with similar conditions have reached hammer prices around 150-200 euros.

5. Estimation Based on Condition and Previous Prices:
- Given that the condition is 70 and considering the previous hammer prices, an estimated maximum purchase price could be positioned in the upper range of the previous hammer prices.

Taking all these factors into account, an estimated maximum purchase price for this coin could be approximately 180 euros. This price reflects a balance between the current condition, previous hammer prices, and interest in the auction.