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

1. Condition: The coin to be auctioned has a condition of 80 (MBC+). This is lower than the coins that have been sold in the past, which have a condition of 90. Generally, better condition translates to a higher price.

2. Previous auction prices: Previous auction prices for coins with a condition of 90 have been 600, 310, and 300 euros. This suggests that, under similar conditions, the auction price could be quite high.

3. Average auction price: The average auction price for this coin has been 403.33 euros, providing an additional reference.

4. Starting price: The starting price is 80 euros, indicating that the auction house expects moderate interest in the coin.

Given that the condition of the coin being auctioned is lower than those that have been sold previously, and considering the average auction price, an estimated maximum purchase price could be set at a lower range than the previous auction prices, but still, it could be attractive to a collector.

Taking all these factors into account, an estimated maximum purchase price could be around 250-300 euros. This is based on the current condition and historical interest in the coin, as well as the average auction price.

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

1. Starting Price: 80 euros.
2. Condition: The coin has a condition rating of 80 (MBC+), indicating that it is in quite good shape.
3. Auction History:
- It has been auctioned 11 times in the past, of which it has sold 7 times.
- The average hammer price in previous auctions is 57.86 euros, but there is a notable hammer price of 120 euros in a previous auction with a condition of 90.
- The last auction in 2022 had a hammer price of 70 euros with a condition of 85.

4. Price Trends:
- The current starting price is higher than the average starting price of 48.64 euros, suggesting that the seller has expectations of a higher price.
- The condition of 80 is better than most of the conditions of previously auctioned coins, which could justify a higher price.

Given that the coin is in good condition and considering the price history, an estimated maximum purchase price could be positioned between the starting price and the highest recorded hammer price.

Taking all this into account, an estimated maximum purchase price could be approximately 100 euros. This is based on the good condition and potential interest from collectors, as well as the highest hammer price observed in the past.

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 70 (VF-). This is an important factor, as coins in better condition tend to reach higher prices.

2. Auction History:
- In the past, this coin has been auctioned 4 times, of which it has sold 2 times. This indicates that there is interest in the coin, but also that there is a 50% no-sale rate, which may influence the perception of its value.
- Previous hammer prices are relevant. For example, in 2014, the coin sold for 124.81 euros, which is a considerably high price compared to the current starting price of 50 euros.

3. Average Hammer Price: The average hammer price of 89.9 euros is a good indicator of the value that buyers are willing to pay.

4. Starting Price: The starting price is 50 euros, which is relatively low compared to previous hammer prices.

5. Market Trends: Since there are no auctions scheduled in the coming days, this may increase competition among bidders interested in this coin.

Taking all these factors into account, an estimated maximum purchase price could be in a range between the average hammer price and the highest previous hammer price.

Therefore, an estimated maximum purchase price could be around 100 euros. This is based on the coin's condition, the demonstrated interest in previous auctions, and the average hammer price.