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. Starting Price: The starting price is 175 euros, which is a good starting point.

3. Auction History:
- The average hammer price in previous auctions is 152.01 euros.
- In past auctions, hammer prices have varied, with some reaching up to 300 euros in similar or better conditions.
- The trend shows that coins with similar conditions have had hammer prices ranging from 130 to 260 euros.

4. Recent Trends: In the most recent auctions, hammer prices have been higher, suggesting an increase in demand or value for the coin.

5. Maximum Price Estimate: Given that the condition is 75 and considering the price history, a reasonable maximum purchase price could be in the range of 200 to 250 euros, taking into account that the highest hammer price in similar conditions has been 300 euros.

Therefore, an estimated maximum purchase price for this coin could be approximately 250 euros.