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

1. Condition: The coin to be auctioned has a condition of 95 (EBC+), indicating that it is in very good shape. This generally increases its value compared to coins with lower conditions.

2. Previous auction prices:
- In previous auctions, hammer prices have varied. The last auction with a condition of 75 had a hammer price of 1300 euros, while another with the same condition also had a hammer price of 1300 euros. The condition of 70 had a hammer price of 650 euros.
- This suggests that the hammer price can significantly increase with better condition.

3. Average hammer price: The average hammer price for coins of this reference is 1316.67 euros, providing a good benchmark.

4. Starting price: The starting price is 1100 euros, indicating that the seller has reasonable expectations for the price.

Given that the condition of the coin in the auction is significantly better than the previous ones (95 compared to 70 and 75), and considering the average hammer price, an estimated maximum purchase price could be positioned above the average hammer price.

Estimated maximum purchase price: It could be reasonable to estimate a maximum purchase price around 1500 euros, given the condition and the history of hammer prices. This allows for a margin for competition in the auction and the value that collectors may be willing to pay for a coin in such good condition.