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 75 (MBC), indicating that it is in fairly good shape, but not the best possible condition.

2. Auction History:
- The average hammer price for similar coins has been 133.82 euros.
- In previous auctions, coins with a similar condition (75) have reached hammer prices that vary, but some examples are:
- 80 euros on 2020-02-12.
- 60 euros on 2020-05-26.
- 60 euros on 2018-09-19.
- 95 euros on 2022-07-07.
- There are also examples of coins with better conditions (80-85) that have reached hammer prices of up to 320 euros.

3. Starting Price and Average Starting Price:
- The starting price is 50 euros, and the average starting price is 57.32 euros. This suggests that the market is willing to pay a little more than the starting price.

4. Recent Trends:
- In the most recent auctions, hammer prices have been quite high, which could indicate an increase in demand.

Based on these factors, an estimated maximum purchase price could be in the range of 120 to 160 euros, considering that the coin has a condition of 75 and there have been examples of hammer prices in that range for coins of similar condition.

Therefore, a reasonable maximum purchase price could be 150 euros.