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

1. Current 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 in lower conditions.

2. Auction History:
- In the past, this coin has had hammer prices that vary significantly. For example, in previous auctions with similar condition (95), hammer prices have reached up to 400 euros (as seen in the auction on 2014-10-30).
- The average hammer price for this coin is 86.11 euros, but there are examples of much higher hammer prices.

3. Starting Price and Estimated Price:
- The current starting price is 90 euros, and the estimated price is 150 euros. This suggests that there are expectations for the coin to sell for a price higher than the starting price.

4. Recent Trends: In the most recent auctions, hammer prices have shown a trend of being higher, especially for coins in good condition.

Based on these factors, an estimated maximum purchase price could be in the range of 200 to 300 euros, considering that the condition is high and there are precedents for hammer prices in that range. However, given the auction history and potential demand, a reasonable maximum purchase price could be 250 euros.