To estimate a maximum purchase price for the coin that will be auctioned, 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 increases its value compared to coins with lower conditions.

2. Auction history:
- The average hammer price for coins with a similar condition (95) has been approximately 60 euros in previous auctions.
- In recent auctions, the hammer price has varied, but it has reached up to 130 euros in a recent auction.

3. Starting price: The starting price is 30 euros, which is relatively low compared to previous hammer prices.

4. Sales trends: The coin has been sold in 52 out of 58 auctions, indicating good demand.

5. Previous estimated prices: Estimated prices have ranged between 30 and 60 euros, but in recent auctions, higher hammer prices have been achieved.

Taking all these factors into account, an estimated maximum purchase price for this coin could be between 80 and 100 euros, considering its good condition and the history of hammer prices in previous auctions. This would allow for competitive bidding in the auction without exceeding the market value it has demonstrated in the past.