To estimate a maximum purchase price for the coin with a grade of 95 (EF+), we can analyze historical data from previous auctions and hammer prices.

1. Current coin data:
- Grade: 95 (EF+)
- Starting price: €18
- Average hammer price: €44.08

2. Relevant historical data:
- In previous auctions, coins with similar grades (around 90-95) have had hammer prices that vary significantly. For example:
- A coin with a grade of 90 was hammered at €48.
- Another with a grade of 95 was hammered at €180.
- There are also examples of coins with a grade of 85 that were hammered at €130.

3. Price analysis:
- The trend shows that coins in high-grade conditions (like 95) can reach hammer prices significantly higher than the average hammer price of €44.08.
- Considering that the highest hammer price in the past for coins of similar grade has been €180, and that the average hammer price is €44.08, we can estimate a price range.

4. Maximum price estimation:
- Given that the coin's grade is high (95), a hammer price that could be considered reasonable might be in the range of €150 to €200.
- To be conservative, an estimated maximum purchase price could be €150.

Therefore, the estimated maximum purchase price for the coin with a grade of 95 (EF+) could be €150.