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

1. Coin Condition: The coin has a condition rating of 70 (MS-), indicating that it is in acceptable condition but not of high quality. This will affect the price, as coins in better condition tend to fetch higher prices.

2. Auction History:
- The average hammer price for this coin is 117.43 euros, suggesting that, in general, buyers are willing to pay around this price.
- In previous auctions, hammer prices for coins with a similar condition (70) have varied, but there are examples where they have sold for prices around 30-40 euros, and others that have reached up to 170 euros under similar conditions.

3. Starting Price: The starting price is 30 euros, which can be a good indicator of the expected sale.

4. Sales Trends: The coin has been auctioned 52 times, of which 48 have sold. This suggests there is consistent interest in this coin, which may influence the price.

5. Comparison with Previous Prices: In previous auctions, coins with a condition of 70 have had hammer prices ranging from 30 to 36 euros, suggesting that this range could be a good reference point.

Taking all these factors into account, an estimated maximum purchase price for this coin could be around 70-80 euros, as this price reflects both the condition and the historical interest in the coin. However, it is important to consider that the final price may vary depending on the competition in the auction and the demand at the time of sale.