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

1. Current Condition: The coin has a condition rating of 70 (VF-), indicating an acceptable but not excellent state. This may influence the price, as coins in better condition tend to fetch higher prices.

2. Auction History:
- It has been auctioned 9 times in the past, of which it has sold 7 times. This indicates good demand.
- The average hammer price in previous auctions is 121.43 euros, which can serve as a reference for the estimated price.

3. Previous Prices:
- In past auctions, hammer prices have varied significantly. For example, in 2020 it sold for 270 euros, while at other times it has been much lower (such as 25 euros in 2021).
- The last auction with a known hammer price was 95 euros for a coin with a condition of 80.

4. Starting Price and Average Starting Price:
- The current starting price is 70 euros, and the average starting price in the past has been 87.14 euros.

Based on this data, an estimated maximum purchase price could be set in a range between the average hammer price (121.43 euros) and the highest recorded price (270 euros), adjusted for the current condition of the coin.

Given that the coin's condition is 70, which is lower than some coins that have sold for higher prices, a reasonable maximum price could be:

Estimated maximum purchase price: 120-150 euros.

This range takes into account the condition and price history, offering a margin that could be attractive to a buyer.