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

1. Current Condition: The coin is in a condition of 95 (EF+), indicating that it is in very good shape. This generally translates to a higher price compared to coins in lower conditions.

2. Starting Price: The starting price is 780 euros. This is the baseline for the auction.

3. Sales History:
- The average hammer price in previous auctions is 673.02 euros.
- In recent auctions, we have seen hammer prices that vary, but some have reached up to 1100 euros under similar conditions.

4. Recent Trends: In the most recent auctions, hammer prices have been in a range of 700 to 1100 euros, suggesting that there is growing interest in this coin.

5. Comparison with Previous Prices: In past auctions, coins with similar conditions have achieved hammer prices that exceed the current starting price.

Taking all these factors into account, an estimated maximum purchase price could be in the range of 900 to 1100 euros, given the condition and interest in the coin. However, to be more conservative and considering the starting price, a reasonable maximum purchase price could be approximately 950 euros.