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 this coin in the past has been 221.91 euros.
- Coins with similar conditions (around 70) have been auctioned at hammer prices that vary, but some examples are:
- 190 euros (condition 75)
- 180 euros (condition 90)
- 234.17 euros (condition 80)
- There are also examples of coins with higher conditions that have reached significantly higher prices, such as 2612.68 euros (condition 90).

3. Starting Price and Average Starting Price:
- The current starting price is 30 euros, which is quite low compared to the average hammer price.
- The average starting price is 129.22 euros, indicating that the market is willing to pay more than the starting price.

4. Recent Trends:
- In the most recent auctions, hammer prices have shown a trend of being higher, especially for coins in good condition.

Based on these factors, an estimated maximum purchase price for this coin could be in the range of 180 to 250 euros, considering that the condition is a limiting factor and that the price history shows that coins in similar conditions have reached those values.

Therefore, a reasonable maximum purchase price could be 250 euros.