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 (MS-). This indicates that it is in an acceptable state, but not of high quality. Coins with a similar condition have had auction prices that vary, but they are generally found in a lower range than those in better condition.

2. Historical Prices: By looking at previous auction prices for coins with a condition of 70, we can see that they have ranged between 95 and 370 euros. The average auction price for coins with a similar condition is approximately 180 euros.

3. Starting Price and Average Auction Price: The current starting price is 175 euros, and the average auction price in previous auctions is 192.24 euros. This suggests that the starting price is aligned with the market.

4. Recent Trends: In the most recent auctions, the auction prices for coins with a condition of 70 have been around 180 euros, indicating that interest in these coins remains steady.

5. Sale Expectations: Given that there are two auctions scheduled in the coming days, this could increase competition and potentially the auction price.

Based on these factors, an estimated maximum purchase price could be around 220-250 euros. This range considers a slight increase over the average auction price, given the current interest and the possibility of competition in the auction.