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

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

2. Auction History:
- The average hammer price in previous auctions is 163.75 euros, indicating that, in general, buyers are willing to pay more than the starting price.
- In the most recent auction (2022), the coin sold for 95 euros, which may be a good indicator of its current value.

3. Starting Price: The current starting price is 75 euros. This can be a good starting point, but given the history of hammer prices, it is likely that the final price will be higher.

4. Comparison with Previous Prices:
- In 2016, the coin sold for 100 euros with a condition of 75, suggesting that the price may be similar or even higher today, given that the condition is the same.
- In 2021, a price of 100 euros was estimated for a condition of 70, reinforcing the idea that the price could be in that range.

Taking all these factors into account, an estimated maximum purchase price could be between 100 and 120 euros. This is based on the history of hammer prices and the current condition of the coin. Therefore, a reasonable maximum purchase price could be 120 euros.