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

2. Starting Price: The starting price is 750 euros. This is the baseline for the auction.

3. Sales History:
- The average hammer price in previous auctions is 627 euros.
- In past auctions, coins with a similar condition (95) have reached hammer prices that vary, but some recent examples show hammer prices of 800 euros and 1100 euros.

4. Price Trends:
- In the most recent auctions, hammer prices for coins of similar condition have been quite high, suggesting increasing demand.

5. Estimated Price: The estimated price for this auction is 850 euros, which also indicates that the coin is expected to reach a price above its starting price.

Based on these factors, an estimated maximum purchase price could be between 900 and 1100 euros, considering the good condition of the coin and the historical hammer price data from previous auctions. This would allow for effective competition in the auction without exceeding a reasonable limit based on historical data.

Therefore, a reasonable maximum purchase price could be 1000 euros.