To estimate a maximum purchase price for the coin that will be auctioned, we will consider several factors:

1. Condition of the coin: 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. Starting price: The starting price is 350 euros. This is a good starting point, but not necessarily the final price.

3. Auction history:
- The average hammer price for similar coins in the past is 152.92 euros, but this can vary depending on the condition.
- In previous auctions, coins with similar conditions have reached hammer prices that varied significantly, with some reaching up to 320 euros for a condition of 85.

4. Recent trends: In the most recent auctions, hammer prices have shown an increase, especially for coins in good condition.

5. Sales expectations: Since 93.33% of the coins auctioned in the past have sold, there is a high probability that this coin will also sell.

Based on these factors, an estimated maximum purchase price could be between 400 and 500 euros, considering that the condition is high and the starting price is 350 euros. This also takes into account the possibility that bidders may be willing to pay more for a coin in such good condition.

Therefore, a reasonable maximum purchase price could be 450 euros.