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

1. Condition of the coin: 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. Current listing price and previous prices: The current listing price is 600 euros. In previous auctions, we have seen hammer prices that vary significantly, but there are examples of coins with similar conditions that have sold for higher prices. For instance, in December 2021, a coin with a condition rating of 95 was sold for 700 euros.

3. Price trends: The average hammer price for this coin in the past is 133.39 euros, but this includes coins with lower conditions. Coins with higher conditions tend to sell for significantly higher prices.

4. Supply and demand: The coin has been auctioned 36 times, of which 33 have sold. This indicates good demand, which can push the price up.

5. Comparison with previous hammer prices: In previous auctions, we have seen hammer prices reaching up to 900 euros for coins of similar condition.

Taking all these factors into account, an estimated maximum purchase price for this coin could be in the range of 700 to 800 euros. This is based on the good condition of the coin and the hammer prices of similar coins in the past.