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-). This indicates that it is in an acceptable state, but not of high quality.

2. Previous Auction Prices:
- The average hammer price for similar coins has been 133.95 euros.
- In previous auctions, coins with a similar condition (70) have reached hammer prices that varied, but some examples are:
- 120 euros (2020-12-16)
- 110 euros (2020-12-15)
- 140 euros (2020-11-19)
- 130 euros (2019-05-23)
- The trend shows that prices can fluctuate, but there is a range of 110 to 140 euros for similar conditions.

3. Starting Price: The starting price is 120 euros, indicating that the seller expects at least this amount.

4. Average Starting Price: The average starting price for similar coins is 89.74 euros, suggesting that the current starting price is relatively high compared to the average.

5. Recent Trends: In the most recent auctions, hammer prices have been higher, which could indicate an increase in demand.

Based on these factors, an estimated maximum purchase price could be in the range of 140 to 160 euros, considering that the coin has a starting price of 120 euros and that there have been recent sales in the upper range. However, since the condition is 70, it is wise not to exceed this range too much to avoid overpaying.

Therefore, a reasonable maximum purchase price could be 150 euros.