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

1. Current Condition: The coin has a condition rating of 75 (MBC), indicating a medium-good quality. This generally translates to a higher price compared to coins with lower conditions.

2. Auction History:
- The average hammer price for similar coins in the past has been 86.06 euros.
- In previous auctions, coins with similar conditions (around 75) have reached hammer prices that varied, but some examples are:
- 2023-05-24: 130 euros (condition 80)
- 2022-05-23: 130 euros (condition 85)
- 2021-06-22: 150 euros (condition 85)

3. Starting Price and Average Starting Price: The current starting price is 60 euros, and the average starting price in the past has been 50.63 euros. This suggests that the current starting price is reasonable and could attract buyers.

4. Price Trends: Observing the trends, it seems that coins with a condition of 75 can reach hammer prices ranging from 100 to 150 euros, depending on demand and other market factors.

Based on these points, an estimated maximum purchase price for this coin could be between 100 and 130 euros, considering that the condition is good and there is a history of hammer prices that supports this estimate.

Therefore, a reasonable maximum purchase price could be 130 euros.