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 fairly good shape, although not the best possible condition.

2. Auction History:
- The coin has been auctioned 8 times, of which it has sold 7 times. This indicates good demand.
- The average hammer price in previous auctions is 746.86 euros, suggesting that, in general, buyers are willing to pay significantly higher prices than the starting price.

3. Previous Prices:
- In past auctions, hammer prices have varied considerably, ranging from 8 euros to 3200 euros, depending on condition and other factors.
- The most recent auction with a similar condition (80) had a hammer price of 65 euros, which may indicate a baseline price.

4. Current Starting Price: The starting price is 60 euros, which is relatively low compared to the average hammer price.

5. Price Trends: Given that the average hammer price is 746.86 euros, and considering that the condition of this coin is 80, it is reasonable to assume that the hammer price could be in a higher range than the starting price.

Based on these factors, an estimated maximum purchase price could be in the range of 300 to 500 euros, considering that the condition is good and that the price history suggests buyers are willing to pay more than the starting price. However, since the average hammer price is significantly higher, a more conservative maximum purchase price could be around 400 euros.