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 75 (MBC), indicating that it is in relatively good shape. This suggests that its value should be above the average for coins with lower conditions.

2. Starting Price and Average Hammer Price: The starting price is 400 euros, and the average hammer price in previous auctions is 642.75 euros. This indicates that, generally, coins of this reference tend to sell for a price higher than the starting price.

3. Sales History: The coin has been auctioned 29 times, of which it has sold 28 times. This suggests high demand and good interest from collectors.

4. Previous Prices: Looking at previous hammer prices, there are examples of coins with similar conditions that have sold for prices that vary significantly. For instance, in 2023, a coin with a condition of 70 sold for 660 euros, which is a good indicator that a coin with a condition of 75 could reach a similar or higher price.

5. Recent Trends: In the most recent auctions, hammer prices have shown an increase, which could indicate an upward trend in the value of these coins.

Taking all these factors into account, an estimated maximum purchase price for the coin could be around 800-900 euros. This is based on the fact that, although the starting price is 400 euros, the auction history and condition suggest it could reach a significantly higher price at auction.

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 95 (EF+), indicating that it is in very good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Previous Prices: By looking at previous auction prices for coins with a similar condition (95), we can see that auction prices have varied but have reached figures close to 400 euros on several occasions.

3. Average Auction Price: The average auction price for this coin is 310.78 euros, providing a solid basis for estimating the price.

4. Starting Price: The current starting price is 350 euros, suggesting that the seller has expectations of a relatively high auction price.

5. Recent Trends: In the most recent auctions, the hammer prices for coins of similar condition have been in the range of 400 to 500 euros.

Taking all these factors into account, an estimated maximum purchase price for this coin could be around 450 euros. This price reflects both the good condition of the coin and recent market trends.

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

1. Current Condition: The coin has a condition of 70 (VF-). This is an important factor, as coins in better condition tend to reach higher prices.

2. Auction History:
- The average hammer price for this coin in the past is 4632.75 euros.
- The coin has been auctioned 41 times, of which it has sold 37 times, indicating good demand.
- Previous hammer prices varied significantly, with some reaching very high figures (for example, 27394.88 euros in 2011).

3. Current Starting Price: The starting price is 750 euros, which may indicate an attractive initial price.

4. Comparison with Previous Prices:
- In previous auctions, coins with similar conditions (75) have reached hammer prices of around 1500 to 5400 euros.
- The last auction with a condition of 80 had a hammer price of 2500 euros.

Given all this, and considering that the condition of the coin is slightly lower than that of some of the more successful auctions, an estimated maximum purchase price could be in the range of 2000 to 3000 euros. This is based on the hammer price history and the current condition of the coin.

Therefore, an estimated maximum purchase price could be 2500 euros.