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

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

2. Auction History:
- The average hammer price for similar coins is 119.06 euros.
- In previous auctions, we have seen hammer prices that varied considerably, but many of them fall within the range of 60 to 120 euros, depending on the condition.
- The last auction of a similar coin with a condition rating of 70 had a hammer price of 100 euros.

3. Starting Price: The starting price is 45 euros, which may attract more bidders, but it can also indicate that the seller expects a lower price initially.

4. Price Trends: Observing previous hammer prices, it seems that coins with a similar condition have reached hammer prices ranging from 60 to 120 euros.

Based on these factors, an estimated maximum purchase price for this coin could be around 100-120 euros, considering that the condition is acceptable and there is a price history that supports this estimate. However, it is important to keep in mind that bidder interest and competition in the auction will also influence the final price.