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

1. Current Condition: The coin has a condition of 70 (VF-), indicating that it is in an acceptable state, but not of the highest quality.

2. Auction History:
- The average hammer price for similar coins has been 94.75 euros.
- In previous auctions, the hammer price has varied depending on the condition. For example, in auctions with a condition of 70, the hammer prices have been 60, 60, and 80 euros.

3. Starting Price: The starting price is 60 euros, which can be a good indicator of the expected sale.

4. Price Trends: Observing previous hammer prices, it seems that coins with similar conditions have reached hammer prices ranging between 60 and 100 euros.

5. Sales Ratio: The coin has been sold in 17 out of 22 auctions, indicating good demand.

Based on these factors, an estimated maximum purchase price could be in the range of 80 to 100 euros, considering that the average hammer price is 94.75 euros and that the condition is acceptable.

Therefore, a reasonable estimated maximum purchase price could be 90 euros.