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 indicates that it is in an acceptable state, but not of high quality. Coins in better condition (for example, 90 or 110) tend to reach significantly higher prices.

2. Historical Prices: By looking at previous auction prices for coins of similar condition, we can see that there is a great variability. For example:
- In 2011, a coin with a condition of 90 was auctioned for 2665.69 euros.
- In 2014, a coin with a condition of 75 sold for 420 euros.
- In 2019, a coin with a condition of 95 sold for 6000 euros.

3. Average Auction Price: The average auction price for this coin is 597.72 euros, suggesting that, in general, coins of this reference tend to sell for relatively high prices.

4. Starting Price: The current starting price is 130 euros, which is quite low compared to previous auction prices.

5. Sales Trends: The coin has been auctioned 34 times, of which 30 have resulted in sales. This indicates good demand in the market.

Given all this, an estimated maximum purchase price could be set in a range that considers the current condition and previous auction prices.

Estimation: Based on the condition of 70 and previous auction prices, a reasonable maximum purchase price could be between 300 and 500 euros. This is based on the trend that coins in similar conditions have reached auction prices in that range, although the exact price may vary depending on demand in the specific auction.

Therefore, an estimated maximum purchase price could be approximately 400 euros.