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

1. Current Condition: The coin has a condition of 75 (MBC), indicating that it is in fairly good shape, but not among the best qualities.

2. Auction History:
- The average hammer price for similar coins in the past has been 37.61 euros.
- Previous auctions of coins with similar conditions (75-80) have had hammer prices that varied, but some examples are:
- 21 euros (2018-04-24)
- 30 euros (2022-06-28)
- 45 euros (2024-05-27)
- The trend shows that hammer prices can reach up to 60 euros in optimal conditions.

3. Starting Price and Average Starting Price:
- The current starting price is 18 euros, and the average starting price is 26.68 euros. This suggests that the market is willing to pay more than the starting price.

4. Demand and Supply:
- The coin has been auctioned 55 times in the past, with 29 sales, indicating moderate interest in the coin.

Based on these factors, an estimated maximum purchase price could be in the range of 40 to 60 euros, considering that the condition is good and that the price history shows that coins in similar conditions have reached hammer prices in that range.

Therefore, a reasonable estimated maximum purchase price could be 50 euros.

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

1. Current Condition: The coin has a condition rating of 75 (MBC), which indicates that it is in quite good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Auction History:
- The average hammer price in previous auctions is 43 euros.
- The coin has been auctioned 19 times, of which it has sold 14 times, indicating good demand.
- Previous hammer prices for coins with similar conditions (75) have varied, but there are examples of auctions reaching up to 80 euros.

3. Starting Price and Estimated Price:
- The current starting price is 40 euros, which is a good starting point.
- The estimated hammer price in previous auctions has been up to 100 euros, although this may be an extreme value.

4. Price Trends:
- Looking at previous hammer prices, it seems that coins with a condition of 75 have reached hammer prices between 60 and 80 euros in the past.

Based on these factors, an estimated maximum purchase price for this coin could be in the range of 70 to 80 euros. This is based on the historical hammer prices for coins of similar condition and the demand observed in previous auctions.

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 75 (MBC), indicating that it is in quite good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Auction History:
- The coin has been auctioned 32 times, of which it has sold 15 times. This indicates a moderate interest in the coin.
- The average hammer price in previous auctions is 32.2 euros, which can serve as a reference for the selling price.

3. Starting and Hammer Prices:
- The current starting price is 40 euros, which is higher than the average starting price of 35.53 euros. This suggests that the seller has higher expectations for this auction.
- In previous auctions, hammer prices for coins with a similar condition (75) have varied, but some have reached up to 80 euros.

4. Price Trends:
- In recent auctions, hammer prices for coins with a condition of 75 have ranged from 30 to 80 euros, depending on demand and other factors.

Based on these points, an estimated maximum purchase price for this coin could be in the range of 60 to 80 euros, considering that the condition is good and there is a price history that supports this estimate. However, since the starting price is 40 euros, buyers may be willing to pay a bit more, but they may not necessarily reach the maximum price in the first auction.

Therefore, a reasonable estimated maximum purchase price could be 70 euros.