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

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

2. Auction History:
- The average hammer price for coins with a similar condition (70) has been approximately 95 euros in previous auctions.
- In recent auctions, hammer prices for coins with a condition of 70 have ranged between 60 and 135 euros.

3. Starting Price and Average Hammer Price:
- The current starting price is 60 euros, and the average hammer price in the past has been 148.42 euros, suggesting there is potential for an increase in the hammer price.

4. Recent Trends: In the most recent auctions, the hammer price has been higher, reaching up to 460 euros for coins in better condition, but coins with a similar condition to the current one have also sold for lower prices.

Based on these factors, an estimated maximum purchase price for this coin could be in the range of 100 to 130 euros, considering that the condition is a limiting factor and that the hammer price can vary depending on demand at the auction.

Therefore, a reasonable maximum purchase price could be 120 euros.