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 80 (MS+), indicating that it is in quite 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 has been 94.91 euros.
- In the past, coins with a similar condition (around 80) have had hammer prices that varied, but some relevant examples are:
- In 2022, a coin with a condition of 80 was sold for 40 euros.
- In 2023, a coin with a condition of 85 was sold for 55 euros.
- In 2022, a coin with a condition of 85 was sold for 130 euros.

3. Starting Price and Average Starting Price:
- The current starting price is 40 euros, and the average starting price for similar coins is 77.73 euros.

4. Recent Trends:
- The price trend appears to be increasing, especially for coins in good condition.

Based on these factors, an estimated maximum purchase price could be between 90 and 120 euros, considering that the condition is good and that the price history shows that similar coins have reached higher prices in recent auctions.

Therefore, a reasonable maximum purchase price could be 100 euros.