To estimate a maximum purchase price for the coin in question, we will 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 coin has been auctioned 35 times, of which it has sold 30 times. This indicates good demand.
- The average hammer price in the past is 76 euros.
- Previous hammer prices for coins with similar conditions (70) have varied, but there are examples of auctions reaching up to 85 euros.

3. Starting Prices and Estimates:
- The average starting price is 50.61 euros, suggesting that auctioneers are starting at a reasonable price.
- Estimated prices in previous auctions for similar conditions have reached up to 150 euros, although this may be an extreme value.

4. Recent Trends: In the most recent auctions, hammer prices have been in the range of 70 to 85 euros for similar conditions.

Based on these factors, an estimated maximum purchase price for the coin with a condition of 70 (VF-) could be in the range of 80 to 100 euros. This is based on the auction price history and the current condition of the coin.

Therefore, a reasonable maximum purchase price could be 90 euros.