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 rating of 75 (MBC), indicating that it is in relatively good shape, but not of the highest quality (FDC).

2. Starting Price and Average Hammer Price: The starting price is 60 euros, and the average hammer price in previous auctions is 142.48 euros. This suggests that, in general, coins of this reference tend to sell for a significantly higher price than their starting price.

3. Sales History: The coin has been auctioned 87 times, of which 84 have been sold. This indicates high demand and good interest in the coin.

4. Previous Prices: By looking at previous hammer prices for coins with a similar condition (75), we can see that they have reached hammer prices that vary, but some have been quite high, especially in higher conditions.

5. Recent Trends: In the most recent auctions, hammer prices have shown a trend of being higher, which could indicate an increase in demand or in the value of the coin.

Based on these factors, an estimated maximum purchase price could be set in a range that considers the average hammer price and the current condition. Given that the average hammer price is 142.48 euros, and considering that the condition is 75, a reasonable maximum purchase price could be:

Estimated maximum purchase price: 150 - 180 euros.

This range allows for competition in the auction and reflects the interest in the coin, as well as its condition.