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 90 (EF), indicating that it is in quite good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Starting Price and Average Hammer Price: The starting price is 200 euros, and the average hammer price in previous auctions is 224.41 euros. This suggests that, in general, coins of this reference tend to sell for above their starting price.

3. Sales History: The coin has been auctioned 59 times, of which 53 have resulted in sales. This indicates good demand and liquidity for this coin.

4. Previous Prices: Looking at previous hammer prices for coins with a similar condition (90), the highest recorded price was 320 euros in a previous auction. However, there are also lower prices, suggesting that the market can be variable.

5. Recent Trends: In the most recent auctions, hammer prices have shown a trend of being in the range of 200 to 300 euros for coins of similar condition.

Based on these factors, an estimated maximum purchase price for this coin could be in the range of 300 to 350 euros. This is based on the good condition, historical demand, and average hammer price. However, it is important to consider that the final price may vary depending on competition in the auction and other market factors at the time of sale.