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

1. Current Condition: The coin has a grade of 70 (MS-), indicating that it is in acceptable condition, but not among the highest quality.

2. Auction History:
- The average hammer price for coins of similar condition (70) has been approximately 130.92 euros.
- In previous auctions, hammer prices for coins with a grade of 70 have ranged between 100 and 140 euros.
- There are examples of coins with a grade of 80 that have sold for up to 170 euros, suggesting that an improvement in condition can significantly increase the price.

3. Starting Price: The current starting price is 125 euros, which is a good starting point.

4. Price Trends: Since the coin has sold in the past and has had an average hammer price of 130.92 euros, this suggests there is consistent interest in this coin.

5. Proximity of Future Auctions: There are 2 auctions scheduled in the coming days, which could increase competition and potentially the hammer price.

Taking all these factors into account, an estimated maximum purchase price could be around 150 euros. This is based on the hammer price history and the current condition of the coin, as well as the possibility that competition in the upcoming auctions may drive up the price.