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 (VF), which indicates that it is in an acceptable state, but not among the best qualities. This will affect the price compared to coins in better condition.

2. Auction History:
- Previous hammer prices for coins with similar conditions (80-90) have varied, but generally, hammer prices have ranged from 500 to 1600 euros.
- The last auction with a condition of 85 had a hammer price of 1400 euros, suggesting that there is a market willing to pay high prices for coins in good condition.

3. Starting Price and Average Hammer Price:
- The current starting price is 480 euros, which is below the average starting price of 638 euros and the average hammer price of 949.09 euros. This suggests that the starting price is attractive and could attract more bidders.

4. Sales Trends: The coin has been sold in 12 of the last 14 auctions, indicating a consistent interest in this reference.

Based on these factors, an estimated maximum purchase price could be in the range of 800 to 1200 euros, considering that the condition is a limiting factor. A more conservative hammer price could be around 900 euros, while an enthusiastic bidder might be willing to go up to 1200 euros, especially if there is competition in the auction.

Therefore, a reasonable estimated maximum purchase price would be 1000 euros.