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

1. Current Condition: The coin has a condition of 70 (MBC-). This is an important factor, as coins in better condition tend to reach higher prices.

2. Previous Auction Prices:
- The average hammer price for similar coins is 148.08 euros.
- Previous hammer prices for coins with similar conditions (70-80) have varied, but they have sold in a range from 95 to 190 euros.

3. Starting Price and Average Starting Price:
- The current starting price is 125 euros, which is slightly higher than the average starting price of 113.67 euros.

4. Sales Trends: The coin has been auctioned 15 times, of which 14 have sold, indicating good demand.

5. Previous Estimates: In previous auctions, the estimated price has been higher than the current starting price, suggesting there may be interest in the coin.

Based on these factors, an estimated maximum purchase price could be in the range of 160 to 180 euros, considering that the condition is a limiting factor and that the average hammer price is 148.08 euros.

Therefore, a reasonable maximum purchase price could be 170 euros. This allows for a margin for competition in the auction, given that the starting price is 125 euros.