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

1. Current Condition: The coin has a condition of 75 (MBC), which indicates 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 similar coins is 104.21 euros.
- In the past, hammer prices have varied significantly, ranging from 25 euros to 399.64 euros, depending on the condition and demand at the time of the auction.

3. Starting Price: The starting price is 70 euros, which may indicate a reasonable base price, but not necessarily the maximum price that could be reached.

4. Price Trends: Looking at previous hammer prices for coins with similar conditions (75), the highest recorded hammer price was 85 euros (in 2011) and 70 euros (in 2022). However, there are examples of coins with higher conditions that have reached significantly higher prices.

5. Demand and Supply: Since there are no auctions scheduled in the coming days, this could indicate that demand might be higher in this specific auction.

Taking all these factors into account, an estimated maximum purchase price for this coin could be in the range of 90 to 120 euros. This is based on the current condition, price history, and general market trends.