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

1. Current Condition: The coin has a condition of 70 (VF-). This indicates that it is in an acceptable state, but it is not of the highest quality.

2. Auction History:
- The average hammer price for similar coins in the past has been 153.69 euros.
- Previous hammer prices for coins with similar conditions (70) have varied, but there are examples where they sold for 130 euros (2020-07-02) and 105 euros (2020-05-26).

3. Price Trends:
- In recent auctions, hammer prices have shown a range from 130 to 270 euros for conditions around 70-95.
- The trend appears to be upward, especially for coins with higher conditions.

4. Starting Price: The starting price is 110 euros, indicating that the seller expects moderate interest.

Based on these factors, an estimated maximum purchase price could be set in a range between 150 and 200 euros, considering that the condition is 70 and that the price history shows that coins in similar conditions have reached hammer prices in that range.

Therefore, an estimated maximum purchase price could be 180 euros. This allows for some margin for competition in the auction and aligns with previous hammer prices.