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

1. Current Condition: The coin has a condition of 75 (MBC), which indicates that it is in fairly good shape, but not of the highest quality (FDC).

2. Auction History:
- The average hammer price for similar coins in the past has been approximately 73.16 euros.
- Previous auctions of coins with a similar condition (around 75) have had hammer prices that varied, but some examples are:
- 55 euros (2022-10-18)
- 60 euros (2022-09-14)
- 70 euros (2021-06-22)
- 75 euros (2020-07-08)
- 85 euros (2020-10-20)

3. Starting Price and Average Starting Price: The starting price is 40 euros, and the average starting price is 45.5 euros. This suggests that the market is willing to pay more than the starting price.

4. Recent Trends: In the most recent auctions, hammer prices have shown a trend of being in the range of 70 to 95 euros for coins of similar condition.

Based on this data, an estimated maximum purchase price for this coin could be in the range of 80 to 90 euros, considering that the condition is good and that the auction price history supports this estimate.

Therefore, a reasonable maximum purchase price could be 85 euros.