To estimate a maximum purchase price for the coin in question, we can consider several factors based on the provided data:

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. Current Starting Price and Previous Prices: The current starting price is 150 euros. In previous auctions, coins with a similar condition (70) have had hammer prices that varied, but many have exceeded 200 euros. For example, in past auctions, the hammer price for coins with a condition of 70 has ranged from 180 to 250 euros.

3. Average Hammer Price: The average hammer price for this coin is 175.06 euros, indicating that, in general, coins of this reference tend to sell for above their starting price.

4. Recent Trends: In the most recent auctions, hammer prices have been in the range of 180 to 250 euros for coins with similar conditions. This suggests that there is consistent demand and that prices may be increasing.

5. Analysis of Previous Sales: Given that 87 out of 95 times it has been auctioned, this indicates a good sales rate, which may be an indicator of the coin's popularity.

Based on these factors, an estimated maximum purchase price could be in the range of 200 to 250 euros. This is because, although the starting price is 150 euros, the trend of hammer prices for coins in similar conditions suggests that buyers are willing to pay more, especially if the coin is sought after.

Therefore, a reasonable estimated maximum purchase price could be 250 euros.