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 (VF), indicating that it is in acceptable shape but not of high quality. This generally affects the price, as coins in better condition tend to fetch higher prices.

2. Auction History:
- The average hammer price in previous auctions is 52.76 euros.
- The coin has been auctioned 16 times, of which it has sold 13 times, indicating good demand.
- Previous hammer prices for coins with similar conditions (75-80) have varied, but there are examples of auctions reaching up to 50-60 euros.

3. Starting Price and Average Starting Price:
- The current starting price is 30 euros, and the average starting price in the past has been 40.81 euros. This suggests that the current starting price is reasonable and could attract buyers.

4. Recent Trends: In the most recent auctions, hammer prices have ranged between 40 and 50 euros for similar conditions.

Based on these factors, an estimated maximum purchase price for this coin could be between 50 and 60 euros, considering that the condition is a limiting factor and that interest in the coin appears to be moderate. Therefore, a reasonable maximum purchase price could be 55 euros.