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 with a higher condition usually fetch higher prices at auctions.

2. Auction History:
- The average hammer price for this coin in the past is 96.02 euros.
- The last auction of this coin with a similar condition (70) had a hammer price of 46 euros in 2018.
- In previous auctions, coins with conditions of 85 and 90 have reached hammer prices of 95 to 160 euros.

3. Starting Price: The current starting price is 45 euros, which is relatively low compared to the average hammer price.

4. Price Trends: Observing the hammer prices of coins with similar conditions, it seems that the price range can vary, but generally falls between 70 and 150 euros for conditions from 70 to 85.

Based on these factors, an estimated maximum purchase price for the coin with a condition of 70 could be in the range of 80 to 120 euros. This is based on the auction price history and the current condition of the coin.

Therefore, a reasonable maximum purchase price could be 100 euros.