To estimate a maximum purchase price for the coin in question, we can consider several factors based on the provided data:

1. Current Condition: The coin has a condition of 70 (VF-). This indicates that it is in an acceptable state, but not of the highest quality. Coins with a higher condition usually fetch higher prices at auctions.

2. Previous Auction Prices:
- The average hammer price from previous auctions is 182.5 euros.
- The current starting price is 120 euros, which is lower than the previous average hammer price.
- In past auctions, hammer prices have varied, but the highest was 395 euros in 2014, although the condition of that coin is not specified.

3. Price Trends:
- The average starting price in previous auctions is 130.83 euros, suggesting that the current starting price of 120 euros is competitive.
- The coin has sold every time it has been auctioned, indicating consistent interest.

4. Estimation Based on Condition and Previous Prices:
- Given that the condition is 70, and considering that in the past similar condition coins have sold for hammer prices around 158 euros (in 2019) and 120 euros (in 2014), we can infer that the hammer price could be in a similar range.

With all this in mind, an estimated maximum purchase price could be around 180-200 euros, assuming that interest in the coin remains and that the condition does not hinder a good auction result. However, since the starting price is 120 euros, it could be a good opportunity to acquire it at a price lower than the estimated.