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 relatively good shape, but not among the highest quality.

2. Auction History:
- The average hammer price for similar coins has been 63.88 euros.
- In previous auctions, hammer prices have varied, with some reaching up to 135 euros in similar or better conditions.

3. Starting Price: The starting price is 30 euros, which may influence the perception of the coin's value.

4. Price Trends: Observing previous hammer prices, there is a trend for coins in similar conditions (75) to sell in a range of 50 to 75 euros, with some exceptional cases reaching higher prices.

Based on these factors, an estimated maximum purchase price for this coin could be around 75-85 euros, considering that the condition is good and there is a price history that supports this estimate. However, it is important to keep in mind that the market can vary and that demand at the time of the auction will also influence the final price.