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 (MBC+), 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 in the past has been 62.31 euros.
- The coin has been auctioned 22 times, of which it has sold 16 times, indicating good demand.
- Previous hammer prices for coins with a similar condition (80) have varied, but the highest recorded price was 85 euros.

3. Starting Price and Estimates:
- The current starting price is 60 euros, which is reasonable given the history of starting and hammer prices.
- The average starting price of 49.55 euros suggests that the current starting price is slightly higher than average, which may indicate the quality of the coin.

4. Recent Trends: In the most recent auctions, hammer prices have been around 70-90 euros for coins of similar condition.

Based on these factors, an estimated maximum purchase price could be between 80 and 90 euros, considering that the condition is good and there is a price history supporting this estimate. Therefore, a reasonable maximum purchase price could be 85 euros.