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 is an important factor, as coins in better condition tend to reach higher prices.

2. Auction History:
- The average hammer price for similar coins has been 198.47 euros.
- In previous auctions, hammer prices for coins with similar conditions (70 and 75) have varied, but they have sold in a range of 70 to 150 euros.
- The last auction of a coin with a condition of 80 had a hammer price of 150 euros.

3. Starting Price and Average Starting Price:
- The current starting price is 110 euros, and the average starting price in the past has been 147.05 euros.

4. Sales Trends: The coin has been sold in 90.91% of the auctions it has participated in, indicating good demand.

Based on this data, an estimated maximum purchase price could be in a range between 150 and 200 euros, considering that the condition is a limiting factor and that the average hammer price is 198.47 euros.

Therefore, a reasonable maximum purchase price could be 180 euros. This allows for a margin for competition in the auction and aligns with previous hammer prices for coins of similar condition.