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 85 (ebc-), which indicates that it is in fairly good shape, but not the best possible condition. This may influence the price, as coins in better condition tend to fetch higher prices.

2. Starting Price and Average Hammer Price: The starting price is 1500 euros, and the average hammer price in previous auctions is 1544.15 euros. This suggests that, in general, coins of this reference tend to sell close to their starting price.

3. Auction History: The coin has been auctioned 34 times, of which it has sold 28 times. This indicates good demand. Additionally, previous hammer prices for coins in similar condition (95) have reached up to 2000 euros.

4. Recent Trends: In the most recent auctions, hammer prices have shown a trend of being in the range of 1600 to 2100 euros for coins in similar condition.

5. Estimated Price: The estimated price for this auction is 1500 euros, suggesting that the seller expects a hammer price in that range.

Taking all these factors into account, an estimated maximum purchase price could be around 1800-2000 euros. This is based on the historical hammer prices for coins in similar condition and the price trends in recent auctions. However, since the condition of this coin is lower than some in previous auctions, a more conservative price might be 1800 euros.