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 this coin is 113.46 euros.
- In previous auctions, coins with a similar condition (80) have reached hammer prices that vary, but some examples are:
- 150 euros (2020-09-17)
- 110 euros (2019-03-14)
- 135 euros (2019-04-24)
- 140 euros (2023-03-16)

3. Starting Price and Average Starting Price:
- The current starting price is 60 euros, and the average starting price is 63.06 euros. This suggests that the starting price is reasonable compared to the price history.

4. Recent Trends: In the most recent auctions, the hammer price has been around 110-140 euros for coins of similar condition.

Based on these points, an estimated maximum purchase price could be in the range of 130 to 150 euros, considering that the average hammer price is 113.46 euros and that there are examples of previous sales exceeding 140 euros.

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