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, although not the best possible condition.

2. Auction History:
- The average hammer price in previous auctions is 74.93 euros.
- In past auctions, hammer prices have ranged from 22 euros to 120 euros, depending on the condition and other factors.
- The last auction for this coin had a hammer price of 35 euros, which may indicate a downward trend in interest or value for the coin.

3. Starting Price and Average Starting Price:
- The current starting price is 30 euros, which is below the average starting price of 50.7 euros. This could suggest that the coin is being auctioned at an attractive price.

4. Sales Trends: Of the 11 times it has been auctioned, it has sold on 8 occasions, suggesting there is reasonable interest in the coin.

Based on these factors, an estimated maximum purchase price could be set in a range that considers the average hammer price and the current condition. Given that the condition is 75 and considering the average hammer price of 74.93 euros, a reasonable maximum purchase price could be:

Estimated maximum purchase price: 80 euros.

This price takes into account the condition, price history, and interest in the coin, allowing for a margin for competition in the auction.