To estimate a maximum purchase price for the coin in question, we can analyze the provided data, including auction history and conservation conditions.

1. Current Condition: The coin has a condition rating of 80 (VF+). This is an important factor, as coins in better condition tend to fetch higher prices.

2. Price History:
- The average hammer price in previous auctions is 1322.78 euros.
- In recent auctions, hammer prices for coins with similar conditions (80-85) have ranged between 1250 and 1600 euros.
- The last auction of a similar coin with a condition of 85 reached a price of 2200 euros, indicating there is potential for price increase depending on demand.

3. Starting Price: The starting price is 1500 euros, suggesting that the seller has expectations of a higher hammer price.

4. Sales Trends: The coin has been sold in 18 out of the 21 previous auctions, indicating consistent interest in this reference.

5. Estimation: Given that the condition is 80 and considering the price history, a reasonable maximum purchase price could be in the range of 1600 to 1800 euros, especially when considering the trend of increasing hammer prices in recent auctions.

Therefore, an estimated maximum purchase price for this coin could be 1800 euros.

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

1. Condition: The coin to be auctioned has a condition of 80 (MBC+), which is a positive factor. In comparison, coins with higher conditions tend to reach higher prices.

2. Previous auction prices: By observing previous hammer prices, we can see that in recent auctions, prices have varied. For example, in the March 2023 auction, a coin with a condition of 95 was sold for 2000 euros, and in another auction in 2022, a coin with a condition of 75 was sold for 1350 euros.

3. Starting price and average hammer price: The current starting price is 1600 euros, and the average hammer price in previous auctions is 1139.09 euros. However, the starting price may be an indicator of the seller's expectations regarding the coin's value.

4. Price trends: The general trend appears to be upward, as hammer prices have been increasing in the most recent auctions.

Taking these factors into account, an estimated maximum purchase price could be in the range of 1800 to 2200 euros. This is based on the coin's condition, previous hammer prices, and the current starting price. A price of 2000 euros could be a reasonable target, given that it has been reached in recent auctions for coins in better condition.

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

1. Condition: The coin has a condition rating of 80 (MS+), indicating that it is in fairly good shape, but not the best possible condition. This may influence the price, as coins in better condition tend to fetch higher prices.

2. Auction History:
- In the past, this coin has been auctioned 5 times, of which it has sold 4 times. This indicates a consistent interest in the coin.
- Previous hammer prices are relevant. For example, at the auction on 2024-11-26, the coin sold for 2300 euros with a condition of 85, suggesting that the price may increase with better condition.
- In the 2021 auction, although the estimated price was 3000 euros, the hammer price was 1600 euros, indicating that the market may be sensitive to price expectations.

3. Starting Price and Average Prices:
- The current starting price is 1500 euros, which is slightly higher than the average starting price of 1366.67 euros.
- The average hammer price is 1775 euros, suggesting that buyers are willing to pay a bit more than the starting price on average.

4. Market Trends: Since there are no scheduled auctions in the coming days, this may influence demand and price.

Taking all these factors into account, an estimated maximum purchase price could be around 2000 euros. This price reflects a balance between the current condition, historical interest in the coin, and previous hammer prices. However, it is important to consider that the final price may vary depending on competition in the auction and buyers' perception of value.

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

1. Current Condition: The coin has a condition rating of 90 (EF), indicating that it is in quite good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Starting Price: The starting price is 1800 euros, which is a good starting point for the estimation.

3. Price History: By looking at previous auction prices for coins with similar conditions (90 or close), we can see that in recent auctions, hammer prices have ranged between 1450 and 1700 euros for coins in similar conditions.

4. Auction Trends: In the most recent auctions, hammer prices have shown an upward trend, especially for coins in good condition. For example, in previous auctions, coins with a condition of 90 have reached hammer prices of up to 1700 euros.

5. Average Hammer Price: The average hammer price for this coin is 1365.75 euros, which can also serve as a reference.

Taking all these factors into account, an estimated maximum purchase price for this coin could be around 2000 euros. This is based on the good condition of the coin, the starting price, and the hammer price history for similar coins.