To estimate a maximum purchase price for the coin in question, we can 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. Previous Prices: By looking at previous auction prices for coins with similar conditions (95 and 90), we can see that they have reached hammer prices of up to 875 euros (in the case of an auction in 2020).

3. Starting Price and Average Hammer Price: The current starting price is 450 euros, and the average hammer price for this coin in the past has been 181.29 euros. However, given the high condition, it is likely that the actual hammer price will be significantly higher.

4. Recent Trends: In recent auctions, coins with similar conditions have reached hammer prices exceeding 800 euros, as seen in the auctions of 2021 and 2022.

Based on these factors, an estimated maximum purchase price for this coin could be in the range of 800 to 1200 euros. This range takes into account the high condition of the coin and previous hammer prices for similar coins.