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 of 75 (MBC), indicating that it is in relatively good shape, but not of the highest quality (FDC).

2. Previous Auction Prices: By looking at previous auction prices for coins with similar conditions, we can see that:
- In past auctions, coins with conditions ranging from 70 to 80 have reached hammer prices between 120 and 280 euros.
- The last auction with a condition of 70 had a hammer price of 120 euros, while one with a condition of 80 reached 260 euros.

3. Average Hammer Price: The average hammer price for this coin is 183.54 euros, which can serve as a good indicator of the expected value.

4. Recent Trends: In the most recent auctions, hammer prices have shown a trend of increasing, especially for coins in good condition.

5. Starting Price: The starting price is 175 euros, suggesting that the seller has expectations of a relatively high hammer price.

Based on these factors, an estimated maximum purchase price could be in the range of 200 to 250 euros, considering that the condition is good and there is interest in the coin. A price of 250 euros could be a reasonable target, given that coins with similar conditions have reached hammer prices in that range.