To estimate a maximum purchase price for the coin in question, we can analyze the provided data, especially the previous auction prices and the current condition of the coin.

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.

2. Previous Auction Prices: By observing the auction prices of coins with similar conditions (70 and 80), we can see that:
- In previous auctions, coins with a condition of 70 have had hammer prices ranging from 112 to 190 euros.
- Coins with a condition of 80 have reached higher hammer prices, going up to 300 euros.

3. Starting Price and Average Hammer Price: The current starting price is 200 euros, and the average hammer price in the past has been 181.53 euros. This suggests that the starting price is slightly higher than the average of what has been sold previously.

4. Auction Trends: The coin has been auctioned 61 times, with a sell-through rate of 96.7% (59 out of 61). This indicates a consistent interest in this coin.

5. Estimation: Given that the condition is 70 and considering the previous hammer prices, a reasonable maximum purchase price could be in the range of 200 to 250 euros. This is based on the fact that the starting price is 200 euros and that, in previous auctions, coins in similar conditions have reached hammer prices of up to 190 euros.

Therefore, an estimated maximum purchase price could be 250 euros. This allows for a margin for competition in the auction, given the interest in the coin.