To estimate a maximum purchase price for the coin in question, we will 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.

2. Auction History:
- The average hammer price for similar coins in the past has been 571.38 euros.
- The condition of the coins auctioned in the past varies, but there are examples of coins with similar conditions that have sold for prices ranging from 130 to 450 euros, depending on the condition and demand at the time of the auction.

3. Starting Price: The starting price is 45 euros, which suggests that the auction house expects moderate interest in the coin.

4. Price Trends: Looking at previous hammer prices, there are examples of coins with conditions of 70 that have sold for around 130 to 300 euros in recent auctions.

Based on these factors, an estimated maximum purchase price for this coin could be between 200 and 300 euros, considering that condition is an important factor and that interest in the coin may vary. Therefore, a reasonable maximum price could be 250 euros.