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

1. Condition: The coin has a condition rating of 95 (EF+), 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 average hammer price for similar coins in the past is 88.63 euros.
- In previous auctions, the coin has reached hammer prices of up to 240 euros (in March 2023) and 160 euros (in March 2022) under similar conditions.
- The current starting price is 90 euros, which is slightly higher than the average starting price of 75.9 euros.

3. Price Trends: The trend of hammer prices for coins of similar condition has shown an increase in recent years, suggesting that interest and value for these coins are on the rise.

4. Demand: The coin has been auctioned 22 times in the past, with a 77% sell-through rate (17 out of 22). This indicates a consistent interest in the coin.

Based on these factors, an estimated maximum purchase price could be in the range of 150 to 200 euros, considering the high condition and the precedents of hammer prices in that range. A price of 180 euros could be a reasonable target, given the auction history and the condition of the coin.