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

1. Current 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. Auction History:
- The coin has been auctioned 8 times and has sold on all occasions, suggesting a consistent demand.
- The average hammer price in previous auctions is 99.38 euros, which can serve as a reference for the current price.
- In the most recent auction (2024-10-28), the coin sold for 160 euros with a condition rating of 85, indicating that the market is willing to pay more for coins in good condition.

3. Starting Price and Estimates:
- The current starting price is 90 euros, which is lower than the historical average hammer price. This may indicate potential for the final price to be higher.
- The estimated hammer price in previous auctions has varied, but generally, coins with similar conditions have reached hammer prices that exceed the starting price.

Taking these factors into account, an estimated maximum purchase price could be in the range of 150 to 180 euros, considering that the condition is high and that the auction history shows hammer prices that have exceeded 160 euros in recent occasions. This also allows for some margin for competition in the auction.