To estimate a maximum purchase price for the coin in question, let's consider the following factors:

1. Starting price: 300 euros.
2. Current condition: 95 (EBC+), which is a very good condition.
3. Auction history: The coin has been auctioned once before, with an estimated price of 500 euros and a hammer price of 460 euros, with a condition of 90.
4. Average hammer price: 460 euros, which is a good indicator of market value.

Since the current condition (95) is better than the condition of the previous auction (90), it is reasonable to assume that the hammer price could be higher than before.

Taking into account the average hammer price of 460 euros and the fact that the condition is better, an estimated maximum purchase price could be in the range of 460 to 500 euros.

Therefore, an estimated maximum purchase price could be 500 euros.