To estimate a maximum purchase price for the coin in question, we will consider several factors:

1. Condition: The coin has a condition rating of 95 (S/C-), indicating that it is in very good shape. This generally increases its value compared to coins with lower conditions.

2. Previous auction prices: By looking at the hammer prices of coins with the same condition (95), we can see that they have reached hammer prices of up to 3200 euros in the past (in 2016). However, there are also more recent prices that are lower, such as 900 euros in 2018 and 1500 euros in 2024.

3. Starting price and average prices: The current starting price is 600 euros, and the average hammer price in previous auctions is 354.46 euros. This suggests that the starting price is relatively high compared to the average hammer price.

4. Sales trends: The coin has been auctioned 43 times, of which it has sold 41 times, indicating good demand and a history of successful sales.

5. Price estimates: In previous auctions, the estimated price has varied, but generally, for coins in similar conditions, the hammer prices have ranged from 360 to 3200 euros.

Based on these factors, an estimated maximum purchase price could be in the range of 1200 to 1500 euros, considering that the coin is in very good condition and there is a history of high prices in the past. However, since the starting price is 600 euros, buyers may be willing to pay more, but they may not necessarily reach the highest prices from previous auctions.

Therefore, a reasonable maximum purchase price could be 1500 euros.