To estimate a maximum purchase price for the coin in question, we can analyze the provided data, taking into account the current condition of the coin (80 - MBC+) and the hammer prices from previous auctions.

1. Condition: The coin has a condition of 80 (MBC+), indicating that it is in fairly good shape. This suggests that it could reach higher prices compared to coins in lower conditions.

2. Previous hammer prices: By observing the hammer prices from previous auctions, we can see that:
- In 2020, a coin with a condition of 95 was sold for 650 euros.
- In 2016, a coin with an unknown condition was sold for 320 euros.
- In 2022, a coin with a condition of 80 was sold for 70 euros.

3. Price trends: The average hammer price for similar coins is 135.45 euros, indicating that, in general, coins of this reference tend to sell for prices above the starting price.

4. Starting price: The starting price of the coin is 60 euros, which is relatively low compared to previous hammer prices.

Based on these factors, an estimated maximum purchase price could be in the range of 150 to 250 euros, considering that the condition of the coin is good and there have been examples of much higher hammer prices in the past.

Therefore, a reasonable maximum purchase price could be 200 euros.