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 fairly good shape, but not the best possible condition.

2. Auction History:
- The average hammer price in previous auctions is 126.92 euros.
- In past auctions, hammer prices have varied, with some reaching up to 220 euros in the highest case (although that coin had a condition rating of 80).
- Most hammer prices for coins with similar condition (75) have been in the range of 90 to 160 euros.

3. Starting Price and Average Starting Price:
- The current starting price is 60 euros, which is below the average starting price of 75.77 euros. This could indicate that there is a buying opportunity at a lower price.

4. Sales Trends: The coin has been sold in 13 out of 15 auctions, suggesting that there is consistent interest in this coin.

Based on these factors, an estimated maximum purchase price could be in the range of 120 to 150 euros, considering that the condition is good and that the auction price history for similar coins supports this estimate.

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