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

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

2. Current Starting Price and Previous Prices: The current starting price is 70 euros. In previous auctions, the average hammer price has been 160.47 euros, indicating that there is significant potential for the hammer price to be considerably higher than the starting price.

3. Sales History: The coin has been auctioned 35 times, of which it has sold 34 times. This suggests that there is a consistent demand for this coin.

4. Previous Hammer Prices: By observing the hammer prices from previous auctions, we can see that they have varied depending on the condition. For example, in recent auctions, coins with similar conditions have reached hammer prices of up to 460 euros.

5. Recent Trends: In the most recent auctions, hammer prices have shown an increase, which could indicate a rising trend in interest for this coin.

Based on these factors, an estimated maximum purchase price could be in the range of 200 to 300 euros, considering that the condition is 70 and there is a history of hammer prices that supports this estimate. However, given the interest and demand, a more conservative maximum purchase price could be approximately 250 euros.