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

2. Previous Auction Prices: By observing the hammer prices of coins with similar conditions, we can see that:
- In 2012, a coin with a condition of 75 sold for 1905.96 and 3200.
- In 2013, another coin with a condition of 75 sold for 2040.78.
- In 2014, a coin with a condition of 90 sold for 1300.
- In 2022, a coin with a condition of 80 sold for 700.

3. Average Hammer Price: The average hammer price for this coin is 2826.02, indicating that, in general, coins of this reference tend to reach high prices.

4. Current Starting Price: The starting price is 350, which is relatively low compared to previous hammer prices.

5. Sales Trends: The coin has been auctioned 15 times, of which 14 have sold, indicating good demand.

Based on these factors, especially considering the condition and previous hammer prices, an estimated maximum purchase price could be in the range of 1500 to 2000 euros. This is based on the fact that, although the condition is slightly lower than some of the coins that have sold for higher prices, the price history and demand suggest it could reach a significant price.

Therefore, an estimated maximum purchase price could be approximately 1800 euros.