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 this coin in the past is 105.42 euros.
- The last auction of this coin with a similar condition (80) had a hammer price of 80 euros in 2020.
- In more recent auctions, hammer prices have varied, but there are examples of sales reaching up to 210 euros in 2018.

3. Starting Price and Average Starting Price:
- The current starting price is 60 euros, which is below the average starting price of 81.14 euros. This suggests that there is potential for the hammer price to be higher.

4. Market Trends: Since the coin has been auctioned 23 times and has sold 20 of those times, there is good demand. Additionally, the fact that it will not be auctioned in the coming days may increase interest.

Based on these factors, an estimated maximum purchase price could be in the range of 120 to 150 euros, considering that the condition is good and that the price history shows that similar coins have reached higher prices in the past.

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