To estimate a maximum purchase price for the coin in question, we can consider several factors based on the provided data:

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

2. Current Starting Price and Previous Prices: The current starting price is 150 euros. In previous auctions, coins with the same condition (95) have had hammer prices that varied, but some have reached up to 360 euros (as in the auction on 2022-10-20).

3. Average Hammer Price: The average hammer price for this coin in the past has been 140.17 euros, suggesting that the current starting price is reasonable.

4. Auction Trends: The coin has been auctioned 46 times, of which 42 have been sold. This indicates good demand and sustained interest in the coin.

5. Recent Hammer Prices: In recent auctions, hammer prices have varied, but there are examples of sales that have exceeded 200 euros, suggesting potential for a higher hammer price.

Considering all these factors, an estimated maximum purchase price could be in the range of 250 to 300 euros, taking into account the high condition and precedents of hammer prices exceeding 200 euros. This also considers the possibility that demand in the current auction may be similar to that of previous auctions.