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 is 161.65 euros.
- In previous auctions, we have seen hammer prices that varied considerably, but some relevant examples are:
- In 2022, a coin with a condition of 70 was sold for 180 euros.
- In 2021, a coin with a condition of 95 was sold for 250 euros.
- In 2018, a coin with a condition of 85 was sold for 150 euros.

3. Starting Price and Average Starting Price:
- The current starting price is 75 euros, which is lower than the average starting price of 102.17 euros. This suggests that there is potential for the hammer price to be higher.

4. Sales Trends: The coin has been sold in 23 out of the last 24 auctions, indicating good demand.

Based on these factors, an estimated maximum purchase price could be in the range of 150 to 180 euros, considering that the condition of the coin is a limiting factor and that the average hammer price for similar coins is 161.65 euros.

Therefore, a reasonable maximum purchase price could be 180 euros.