To estimate a maximum purchase price for the coin in question, we can analyze the provided data, especially the coin's condition and previous auction prices.

1. Coin Condition: The coin has a condition rating of 70 (MBC-), indicating that it is in relatively good shape, but not of the highest quality (FDC).

2. Previous Auction Prices:
- In previous auctions, we have seen hammer prices that vary significantly. For example:
- In 2019, a similar coin was auctioned for 20 euros.
- In 2022, it was auctioned for 30 euros with a condition of 30.
- In 2022, another coin with a condition of 85 had a hammer price of 50 euros.
- In 2024, a coin with a condition of 70 was auctioned for 50 euros.

3. Average Hammer Price: The average hammer price for this coin is 57.75 euros, suggesting that, in general, coins of this reference tend to reach higher prices.

4. Starting Price: The starting price is 25 euros, which may be a good indicator of the sales expectation.

Given that the coin's condition is 70 and considering the previous hammer prices, an estimated maximum purchase price could be in the range of 40 to 60 euros. However, since the average hammer price is 57.75 euros, a reasonable maximum purchase price could be:

Estimated Maximum Purchase Price: 60 euros.

This price takes into account the coin's condition and previous hammer prices, as well as the market context.