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

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

2. Auction history:
- The average hammer price for similar coins has been 28 euros.
- In previous auctions, coins with similar condition (95) have sold for varying prices, with some reaching up to 72 euros (as in 2014) and 55 euros (in 2021).

3. Starting price and previous prices:
- The current starting price is 15 euros, which is reasonable given the history of starting and hammer prices.
- The average starting price of 16.45 euros also suggests that the current starting price is competitive.

4. Price trends:
- The price trend appears to be on the rise, especially for coins in good condition.

Taking all these factors into account, an estimated maximum purchase price for this coin could be around 55-70 euros, as this is a range that has been reached in previous auctions for coins of similar condition. However, since the market can fluctuate, a price of 60 euros could be a reasonable and competitive target.