To estimate a maximum purchase price for the coin in question, we will 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 excellent. This generally affects the price, as coins in better condition tend to reach higher prices.

2. Auction History:
- The coin has been auctioned 7 times, of which it has sold 6 times. This indicates a consistent interest in the coin.
- The average starting price in previous auctions is 217.86 euros, and the average hammer price is 497.5 euros. This suggests that, in general, buyers are willing to pay much more than the starting price.

3. Previous Prices:
- In previous auctions, hammer prices have varied significantly, ranging from 35 euros to 1700 euros, depending on the condition and other factors.
- The last auction with a similar condition (70) had a hammer price of 800 euros.

4. Current Starting Price: The starting price is 60 euros, which is relatively low compared to the average starting price and the average hammer price.

Taking all these factors into account, an estimated maximum purchase price could be in the range of 300 to 500 euros, considering that the condition is not the best and that the interest in the coin is moderate. However, given the history of hammer prices, a reasonable maximum purchase price could be approximately 400 euros.