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-). This is an important factor, as coins in better condition tend to reach higher prices.

2. Auction History:
- The average hammer price for similar coins is 597.72 euros.
- The average starting price is 354.19 euros.
- In the past, significantly higher hammer prices have been recorded for coins with better conditions (for example, 2665.69 euros for a condition of 90).

3. Price Trends:
- The coin has been auctioned 34 times, of which 30 have sold. This indicates a consistent interest in the coin.
- The last auction with a similar condition (70) had a hammer price of 150 euros.

4. Comparison with Previous Prices:
- In previous auctions, hammer prices for conditions of 75 and 80 have ranged from 220 to 600 euros, suggesting that a condition of 70 could be in a similar range, albeit slightly lower.

Based on these factors, an estimated maximum purchase price for the coin in its current state could be between 150 and 300 euros. Given that the average hammer price is 597.72 euros, but considering the condition and previous hammer prices, a reasonable maximum price could be approximately 250 euros.