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.
- Generally, hammer prices for grades from 90 to 95 have ranged between €30 and €440.

3. Hammer price analysis:
- The trend shows that coins in EF+ condition (95) can reach significantly higher prices than the average hammer price of €44.08.
- Looking at the highest hammer prices in the past, the price of €180 seems to be a good benchmark for a coin in this condition.

4. Maximum purchase price estimation:
- Given the high grade and considering previous hammer prices, a reasonable maximum purchase price could be in the range of €150 to €200.

Therefore, an estimated maximum purchase price for this coin could be approximately €180.