To estimate a maximum purchase price for the coin in question, we will 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:
- The average hammer price for this coin is 80.8 euros.
- In previous auctions, hammer prices have varied, but there are examples of sales reaching up to 320 euros (in 2024).
- The last auction with a similar condition (95) had a hammer price of 75 euros.

3. Starting Price and Average Starting Price:
- The current starting price is 45 euros, which is below the average hammer price. This suggests that there could be potential for an increase in the hammer price.

4. Sales Trends: The coin has been sold in 21 out of 25 auctions, indicating good demand.

Based on these factors, an estimated maximum purchase price could be in the range of 100 to 120 euros, considering that the condition is high and that the price history shows that similar coins have reached higher prices in the past.

Therefore, a reasonable maximum purchase price could be 120 euros.