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 (EBC+), indicating that it is in very good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Previous auction prices: By looking at the hammer prices of coins with similar conditions (95), we can see that they have reached hammer prices of up to 1320 euros (in the case of an auction in 2019). There was also a hammer price of 900 euros in 2017 and 600 euros in 2020.

3. Average hammer price: The average hammer price for this coin is 164.55 euros, but this may be influenced by coins of lower condition.

4. Starting price: The starting price is 200 euros, which can be a good indicator of the seller's expectations.

5. Market trends: Given that the coin has been auctioned 99 times and has had a high sales percentage (86 out of 99), this suggests that there is consistent interest in this coin.

Taking all these factors into account, an estimated maximum purchase price could be in the range of 600 to 800 euros, considering that the condition is high and there are precedents for hammer prices in that range. However, given the starting price of 200 euros, it is likely that the final hammer price will not exceed 800 euros, unless there is significant competition among bidders.