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

1. Current Condition: The coin has a condition of 75 (MBC), which indicates that it is in fairly good shape, but not of the highest quality (FDC).

2. Auction History:
- The average starting price of similar coins is 276.3 euros, and the average hammer price is 431.6 euros.
- In the past, coins with the same condition (75) have been auctioned at prices that varied significantly, from 32 euros to 1750 euros. However, the most relevant prices are those that are close to the current condition.

3. Previous Hammer Prices:
- In previous auctions, coins with a condition of 75 have reached hammer prices of up to 1750 euros, but there are also examples of lower hammer prices, such as 210 euros and 180 euros.

4. Current Starting Price: The starting price is 60 euros, which is relatively low compared to the average starting price of 276.3 euros.

5. Recent Trends: In the most recent auction, a coin with a condition of 30 sold for 180 euros, suggesting that there is interest in quality coins, even though the condition is lower.

### Estimation of Maximum Purchase Price
Given that the condition of the coin is 75 and considering the history of hammer prices, a reasonable maximum purchase price could be in the range of 300 to 500 euros. This is based on the average hammer price and the fact that the coin has a low starting price, which could attract more bidders.

Therefore, an estimated maximum purchase price could be approximately 450 euros. This allows for a margin for competition in the auction, given the potential interest in coins of good condition.