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

1. Current Condition: The coin has a condition rating 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 132.6 euros.
- In previous auctions, coins with a similar condition (70) have reached hammer prices that varied, but some examples are:
- 120 euros (2020-10-20)
- 140 euros (2020-09-17)
- 130 euros (2020-12-15)
- 150 euros (2020-10-21)

3. Starting Price and Average Starting Price: The current starting price is 90 euros, and the average starting price has been 95.11 euros. This suggests that the starting price is reasonable compared to the history.

4. Recent Trends: In the most recent auctions, the hammer price has been higher, indicating a possible upward trend in interest for this coin.

5. Previous Estimates: Estimated prices in previous auctions for coins with similar conditions have been up to 160 euros.

Based on these factors, an estimated maximum purchase price for this coin could be between 130 and 160 euros, considering that the average hammer price has been 132.6 euros and that there are examples of higher hammer prices in the past.

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