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

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

2. Current and Previous Prices: The current starting price is 450 euros. In the past, this coin has had auction prices that vary significantly, but some of the highest prices reached in previous auctions are:
- 270 euros (2017)
- 350 euros (2024)
- 260 euros (2020)

3. Price Trends: Looking at the auction prices of coins with similar conditions (around 90-95), it seems that the price range can be quite broad, but the highest auction prices for coins in similar conditions have been in the range of 250 to 350 euros.

4. Average Auction Price: The average auction price for this coin is 75.81 euros, but this may be influenced by coins in worse conditions.

5. Supply and Demand: Since it will be auctioned in the coming days and there is significant interest (2 scheduled auctions), this could increase competition and, therefore, the price.

Considering all these factors, an estimated maximum purchase price could be in the range of 350 to 450 euros, given that the starting price is 450 euros and the condition is high. However, since the starting price is already 450 euros, it is likely that the final price will not significantly exceed this value unless there is strong competition in the auction.

Maximum Purchase Estimate: 450 euros.