To estimate a maximum purchase price for the coin with a grade of 95 (EBC+), we can analyze historical data and price trends.

1. Current starting price: 400 euros.
2. Average hammer price in the past: 203.77 euros.
3. Coin grade: 95 (EBC+), which is a high grade and generally translates to higher prices at auctions.
4. Previous prices of coins with similar grades:
- In previous auctions, coins with grades from 90 to 95 have reached hammer prices that vary considerably, but some examples are:
- 430 euros (grade 90)
- 240 euros (grade 90)
- 300 euros (grade 95)
- 650 euros (grade 95, although in an exceptional case).

5. Price trends:
- The coin has been auctioned 133 times, of which 118 have been sold. This indicates a consistent interest in the coin.
- The average starting price of 125.58 euros and the average hammer price of 203.77 euros suggest that the market is willing to pay more than the starting price on many occasions.

6. Estimation:
- Given that the grade is high (95), and considering the previous hammer prices for coins of similar grade, a reasonable maximum purchase price could be in the range of 600 to 800 euros, especially considering that the starting price is 400 euros and there is interest in the coin.

Therefore, an estimated maximum purchase price for this coin could be 700 euros.