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 85 (EF-), indicating that it is in quite good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Current Listing Price and Previous Prices: The current listing price is 750 euros. In previous auctions, we have seen hammer prices that vary, but there are recent examples where coins with similar conditions have reached hammer prices of up to 1100 euros.

3. Price Trends: The average hammer price for similar coins is 673.02 euros, suggesting that the current listing price is a bit higher than average. However, there are also examples of recent sales that exceed this average.

4. Sales History: The coin has sold in 68 out of 79 auctions, indicating good demand. Additionally, the fact that there are no auctions scheduled in the coming days suggests that there may be less competition in this specific auction.

5. Recent Hammer Prices: In the most recent auctions, we have seen hammer prices ranging from 700 to 1100 euros for coins of similar condition.

Taking all these factors into account, an estimated maximum purchase price for this coin could be around 950 euros. This is based on the hammer price history, the current condition, and the price trend in the market.