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 has been 78.57 euros.
- In previous auctions, hammer prices have varied, with a maximum of 200 euros (in 2018) for a coin in superior condition (95).
- The last auction with a similar condition (80) had a hammer price of 90 euros.

3. Starting Price and Estimated Price:
- The current starting price is 60 euros, which is reasonable given the price history.
- The estimated price of 60 euros also aligns with the starting price.

4. Sales Trends: The coin has been sold in 22 out of 24 auctions, indicating good demand.

Based on these factors, an estimated maximum purchase price could be around 90-100 euros, considering that the condition is good and that the auction price history supports this figure. This also takes into account the price trends in recent auctions and the interest in the coin.