To estimate a maximum purchase price for the coin in question, we can analyze the provided data and 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 in lower conditions.

2. Auction History:
- The average hammer price for coins of this reference is 544.33 euros.
- In previous auctions, hammer prices have varied, but there are examples of coins with similar conditions that have sold for prices ranging from 400 to 1400 euros, depending on the condition and demand at that time.

3. Starting Price and Average Starting Price:
- The current starting price is 300 euros, which is below the average starting price of 430 euros. This could indicate a good buying opportunity if demand is high.

4. Sales Trends: The coin has sold in 9 out of the last 10 auctions, suggesting there is consistent interest in this coin.

5. Comparison with Previous Prices:
- The last auction with a condition of 95 had a hammer price of 1400 euros, suggesting that if demand is similar, the price could be in a high range.

Based on these factors, an estimated maximum purchase price could be in the range of 800 to 1200 euros, considering that the condition is high and there is a history of hammer prices that supports this estimate. However, the exact price will depend on the competition in the auction and the interest from other buyers.