To estimate a maximum purchase price for the coin with a grade of 85 (ebc-), we can analyze historical data from previous auctions of coins with a similar grade.

1. Relevant data from previous auctions:
- In the past, coins with a grade of 85 have had hammer prices that varied, but we can observe some examples:
- 2020-11-10: Hammer price of 340 with a grade of 85.
- 2020-10-20: Hammer price of 326 with a grade of 85.
- 2020-07-02: Hammer price of 320 with a grade of 85.
- 2020-05-26: Hammer price of 314 with a grade of 85.

2. Price analysis:
- The hammer prices for coins with a grade of 85 have been in a range of approximately 314 to 340 euros.
- The average hammer price for coins with a grade of 85 seems to be around 320 euros.

3. Additional considerations:
- The current starting price is 460 euros, which is significantly higher than the previous hammer prices for similar grades.
- Since the starting price is higher than historical prices, it is possible that the demand or rarity of this particular coin justifies a higher price.

4. Estimation of the maximum purchase price:
- Based on historical data and the starting price, a reasonable maximum purchase price could be in the range of 340 to 360 euros, considering that the starting price is higher and there may be interest in the coin.

Therefore, an estimated maximum purchase price for this coin could be 360 euros.