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 that it is in quite good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Auction History:
- The average hammer price for this coin in the past is 148.03 euros.
- In previous auctions, hammer prices have varied, but some have reached up to 340 euros under similar conditions.
- The last auction where a coin with a similar condition (75) was sold had a price of 200 euros.

3. Starting Price: The current starting price is 150 euros, which may influence the final price, as buyers often consider the starting price as an indicator of value.

4. Market Trends: Since the coin has been auctioned 36 times and has had a sell-through rate of 86.1% (31 out of 36), this suggests there is consistent interest in this coin.

Based on these factors, an estimated maximum purchase price could be in the range of 200 to 250 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 250 euros.