To estimate a maximum purchase price for the coin in question, we can analyze the provided data, including the starting price, the average hammer price, and previous prices from similar auctions.

1. Current starting price: 1600 euros.
2. Average hammer price: 1599.72 euros.
3. Condition of the coin: 95 (S/C-), which is a high condition.
4. History of prices from previous auctions:
- In previous auctions with the same condition (95), hammer prices have varied, but many have exceeded 1600 euros, reaching up to 2000 euros on some occasions.
- The highest recorded hammer price in the past for this condition was 2100 euros.

Given that the condition of the coin is high and considering the history of hammer prices, an estimated maximum purchase price could be set in a range above the current starting price.

Estimated maximum purchase price:

- Based on the history of hammer prices and the condition, a reasonable maximum price could be between 2000 to 2200 euros. This aligns with previous hammer prices and reflects the high demand that a coin in this condition may have.

Therefore, I would recommend considering a maximum purchase price of 2000 euros to be competitive, but you could be willing to go up to 2200 euros if the competition is strong.