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

1. Current Condition: The coin has a condition rating of 95 (EBC+), indicating that it is in very good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Previous Prices: Looking at previous auction prices for coins with a similar condition (95), the highest price was 3800 euros in 2019. However, there are also more recent auctions showing lower prices, such as 1030 euros in 2023 for a coin with a condition of 85.

3. Average Auction Price: The average auction price for this coin is 1376 euros, which can serve as a good reference point.

4. Starting Price and Average Starting Price: The current starting price is 800 euros, and the average starting price in previous auctions is 933.33 euros. This suggests that the starting price is reasonable and could attract bidders.

5. Sales Trends: The coin has been sold in 11 out of the last 12 auctions, indicating good demand.

Taking all these factors into account, an estimated maximum purchase price could be in the range of 2000 to 3000 euros, considering that the condition is high and there is a history of auction prices supporting this estimate. A more conservative price could be around 2500 euros, given the current market context and price trends.