To estimate a maximum purchase price for the coin in question, we can consider several factors based on the provided data:

1. Current Condition: The coin has a condition rating of 80 (MBC+), indicating that it is in quite good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Current Listing Price and Previous Prices: The current listing price is 60 euros, and the average listing price in previous auctions is 83.06 euros. The average hammer price is 143.64 euros, suggesting that similar coins have had good market interest.

3. Sales History: Out of the 16 times it has been auctioned, it has sold 11 times, indicating a good sales rate. Additionally, the highest recorded hammer price in the past was 320 euros in a recent auction.

4. Recent Trends: In the most recent auctions, hammer prices have been quite high, especially for coins with similar conditions. For example, in the 2022 auction, a coin with a condition of 80 sold for 320 euros.

5. Data-Based Estimation: Given that the average hammer price is 143.64 euros and considering the condition of the coin, an estimated maximum purchase price could be positioned between the average hammer price and the highest recorded price.

Taking all these factors into account, an estimated maximum purchase price for this coin could be approximately 200-250 euros. This is based on the good condition, market interest, and previous hammer prices.