To estimate a maximum purchase price for the coin in question, let's consider several factors:

1. Starting Price: 3000 euros. This is the initial price set for the auction.
2. Condition: The coin has a condition rating of 80 (VF+), which is an acceptable level, but not among the highest. This may influence the price, as coins in better condition tend to reach higher prices.
3. Auction History:
- It has been auctioned 2 times in the past, of which it sold 1 time and did not sell 1 time.
- The average hammer price in previous auctions was 3200 euros, indicating that there is interest in the coin at prices close to this value.
4. Previous Prices:
- In the May 2022 auction, the coin sold for 3200 euros with a condition of 85, which is better than the current one.
- In the December 2021 auction, the estimated price was 2500 euros, but it did not sell.

Given that the average hammer price is 3200 euros and considering that the current condition is slightly lower than that of the last sale, an estimated maximum purchase price could be in a range between the starting price and the average hammer price.

Taking all these factors into account, an estimated maximum purchase price could be around 3000 to 3200 euros. This is based on the interest shown in previous auctions and the condition of the coin.