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

2. Starting Price: The starting price is 150 euros. This is the baseline for the auction.

3. Sales History:
- The average hammer price in previous auctions is 190.06 euros.
- In past auctions, coins with a similar condition (70) have reached hammer prices that varied, but some examples are:
- 170 euros (2020-10-20)
- 150 euros (2019-07-03)
- 180 euros (2023-01-18)
- 230 euros (2023-02-16)

4. Recent Trends: In the most recent auctions, hammer prices have shown a range that can reach up to 280 euros for coins of similar condition.

5. Auction Expectations: Given that there are 2 auctions scheduled in the coming days, this may increase competition and, therefore, the price.

Based on these factors, an estimated maximum purchase price could be in the range of 200 to 250 euros. This is because, although the starting price is 150 euros, the sales history and condition suggest that there could be enough interest for the hammer price to exceed 200 euros, especially if there is competition in the auction.

Therefore, a reasonable maximum purchase price could be 250 euros.