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

1. Condition: The coin has a condition rating of 85 (ebc-), which indicates that it is in quite good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Current and previous prices: The current starting price is 1450 euros, which is above the average starting price of 1005.36 euros and the average hammer price of 1233.79 euros. However, in previous auctions, the coin has reached hammer prices of up to 1600 euros under similar conditions.

3. Price trends: Looking at previous hammer prices, the coin has reached prices of up to 1500 euros in recent auctions, suggesting that there is growing interest in this coin.

4. Auction expectations: Since there are no auctions scheduled in the coming days, this could increase competition among bidders in the next auction, potentially driving up the price.

Taking all these factors into account, an estimated maximum purchase price could be around 1600-1700 euros, considering that this is a price that has been reached in the past and that the coin's condition is favorable. However, the starting price of 1450 euros also suggests that there may be room for competitive bidding.