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

1. Current Condition: The coin has a condition rating of 80 (MBC+), which indicates 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 113.28 euros.
- In previous auctions, hammer prices have varied, but there are examples of coins with similar conditions that have sold for prices ranging from 55 to 180 euros, depending on the condition and demand at that time.

3. Starting Price and Average Starting Price:
- The current starting price is 60 euros, which is below the average starting price of 76 euros. This could indicate that there is a buying opportunity at a reasonable price.

4. Price 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 120 to 150 euros. This is based on the hammer price history for coins of similar condition and the fact that the average hammer price is 113.28 euros.

Therefore, a reasonable maximum purchase price could be 150 euros.