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 (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 this coin in the past is 161 euros.
- The last auction where the coin was sold had a hammer price of 250 euros, which is the same as the current starting price. This suggests that the market is willing to pay at least this price.

3. Starting and Estimated Prices:
- The current starting price is 250 euros, which is higher than the average starting price of 81.92 euros, indicating that the seller has high expectations for this auction.
- The estimated price in previous auctions has varied, but it has reached up to 400 euros on one occasion.

4. Sales Trends: The coin has been sold in 12 out of the last 13 auctions, indicating good demand.

Based on these factors, an estimated maximum purchase price could be in the range of 250 to 400 euros. Given that the highest hammer price in the past was 250 euros and considering the good condition, a reasonable maximum price could be approximately 350 euros. This allows for some competition in the auction, but it is also based on the price history and the current condition of the coin.