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 relatively good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Previous Auction Prices: By observing previous auction prices for coins with similar conditions, we can see that:
- In past auctions, coins with a condition of 80 have reached hammer prices of up to 190 euros (for example, in the auction on 2022-10-19).
- There are also examples of coins with a condition of 85 that have sold for 480 euros (2023-01-31), indicating that there is a market willing to pay high prices for well-preserved coins.

3. Average Hammer Price: The average hammer price for this coin is 158 euros, providing a good reference point.

4. Starting Price: The starting price is 75 euros, suggesting that there is considerable room for the hammer price to be higher.

5. Market Trends: Since the coin has been auctioned 51 times and has had a sell-through rate of 94% (48 out of 51), this indicates a consistent interest in this coin.

Based on these factors, an estimated maximum purchase price could be in the range of 180 to 220 euros. This range takes into account the current condition, previous hammer prices, and market interest.