To estimate a maximum purchase price for the coin in question, we can consider several factors based on the provided data:

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 in lower conditions.

2. Auction History:
- The average hammer price for similar coins in the past is 76.31 euros.
- The last auction for this coin had a hammer price of 220 euros in March 2023, indicating significant potential for higher prices depending on demand.

3. Price Trends:
- Hammer prices have varied, but there are examples of auctions reaching up to 130 euros for coins in similar conditions.
- The overall trend appears to be upward, especially for coins in good condition.

4. Starting Price and Average Starting Price:
- The current starting price is 50 euros, which is below the average hammer price. This suggests that there may be a buying opportunity at a reasonable price.

5. Analysis of Previous Prices:
- Looking at previous hammer prices, the price range for coins with similar conditions has been between 60 and 130 euros.

Based on these factors, an estimated maximum purchase price for this coin could be in the range of 100 to 130 euros. This is based on the current condition, price history, and market trend. However, it is important to consider the demand in the specific auction, as this can influence the final price.