To estimate a maximum purchase price for the coin in question, let's consider several factors:

1. Condition: The coin has a condition rating of 95 (S/C-), 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 this coin in the past has been approximately 146.02 euros.
- In previous auctions, the hammer price has varied, reaching up to 270 euros on some occasions, although this can depend on demand and other market factors at that time.

3. Starting Price: The current starting price is 150 euros, which is a good indicator that the seller has reasonable expectations about the coin's value.

4. Recent Trends: In the most recent auctions, hammer prices have shown an increase, which could indicate an upward trend in the value of this coin.

Taking all these factors into account, an estimated maximum purchase price could be in the range of 200 to 250 euros. This is based on the hammer price history and the good condition of the coin. However, the final price will depend on the competition in the auction and the demand at the time.