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

1. Current Condition: The coin has a condition rating of 75 (MBC), indicating a medium-low state of preservation. This can influence the price, as coins in better condition tend to fetch higher prices.

2. Auction History:
- The average hammer price for similar coins in the past is 160.47 euros.
- The last auction of a coin with a similar condition (75) had a hammer price of 210 euros.
- Overall, hammer prices have varied, but there are examples of sales exceeding 200 euros for coins of similar condition.

3. Starting Price and Average Starting Price:
- The current starting price is 75 euros, which is relatively low compared to previous hammer prices.
- The average starting price of 78.91 euros also suggests that the current starting price is competitive.

4. Recent Trends: In the most recent auctions, hammer prices have shown an increase, which could indicate a rising trend in interest for this coin.

Based on these factors, an estimated maximum purchase price could be between 200 and 250 euros, considering that the highest recent hammer price was 210 euros and that there is potential for increased interest in the coin. However, given that the condition is 75, it is wise not to exceed 250 euros to avoid overpaying relative to its state.

Therefore, a reasonable maximum purchase price could be 250 euros.