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

1. Current Condition: The coin has a condition rating of 80 (MS+), indicating that it is in relatively good shape, but not of the highest quality.

2. Auction History:
- The average hammer price for similar coins in condition 80 has been approximately 40-70 euros in previous auctions.
- There are examples of coins with similar condition that have sold for prices ranging from 10 to 190 euros, depending on demand and other factors.

3. Starting Price and Average Hammer Price:
- The current starting price is 25 euros, which is quite low compared to the average hammer price of 162.93 euros for similar coins.
- The average starting price of 93.96 euros also suggests that there is potential for an increase in the hammer price.

4. Recent Trends: In the most recent auctions, hammer prices exceeding 200 euros have been seen for coins of similar condition, indicating a possible increase in demand.

Based on these factors, an estimated maximum purchase price for this coin could be in the range of 80 to 120 euros. This range takes into account the current condition, the auction price history, and the starting price. However, it is important to note that the final price may vary depending on competition in the auction and specific demand at the time of sale.