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

1. Current Condition: The coin has a condition 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. Previous Auction Prices: By looking at previous auction prices for coins with a similar condition (80-85), we can see that they have reached auction prices of up to 130 euros in recent sales.

3. Average Auction Price: The average auction price for this coin is 101.35 euros, providing a good reference for the expected value.

4. Recent Trends: In the most recent auctions, the auction prices have shown a trend of being in the range of 70 to 110 euros for similar conditions.

5. Starting Price and Average Starting Price: The starting price is 60 euros, and the average starting price is 64.78 euros. This suggests that the market is willing to pay a bit more than the starting price.

Taking all these factors into account, an estimated maximum purchase price for this coin could be around 120-130 euros, as this price reflects both the condition and recent price trends in similar auctions.