To estimate a maximum purchase price for the coin in question, we will consider several factors:

1. Current Condition: The coin has a condition rating of 70 (VF-), indicating that it is in acceptable shape, but not among the best qualities. This may influence the price, as coins in better condition tend to fetch higher prices.

2. Auction History:
- The average hammer price for coins of similar condition (70) has been approximately 55-80 euros in previous auctions.
- In recent auctions, hammer prices of up to 120 euros have been seen for coins with a condition of 80, suggesting that there is an active market and that prices can vary depending on demand.

3. Starting Price and Average Hammer Price:
- The current starting price is 45 euros, which is below the average starting price of 65.5 euros. This could indicate that there is a buying opportunity at a reasonable price.
- The average hammer price of 71.56 euros also suggests that, under normal conditions, the coin could sell for a price higher than the starting price.

4. Recent Trends: In the most recent auctions, hammer prices have been higher, which could indicate an increase in demand or interest in this coin.

Based on these factors, an estimated maximum purchase price for this coin could be between 80 and 100 euros. This is based on the historical hammer prices for coins of similar condition and the price trends in recent auctions. However, it is important to keep in mind that the final price will depend on the competition in the auction and the willingness of other buyers.