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 400 euros. This is the baseline for the auction.

3. Sales History: The coin has been auctioned 148 times, of which it has sold 142 times. This indicates good demand and a history of successful sales.

4. Previous Prices: Looking at previous hammer prices for coins with similar conditions (around 90-95), the hammer prices have varied, but many have exceeded 300 euros, reaching up to 400 euros or more in some cases.

5. Recent Trends: In the most recent auctions, hammer prices for coins of similar condition have been in the range of 360 to 450 euros.

Based on these factors, an estimated maximum purchase price could be in the range of 450 to 500 euros, considering that the condition is high and there is good demand in the market. This also takes into account the starting price and the history of hammer prices.

Therefore, an estimated maximum purchase price for this coin could be approximately 500 euros.