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

1. Current Condition: The coin has a condition of 80 (VF+), which indicates that it is in relatively good shape, but not the best possible condition.

2. Previous Auction Prices: By looking at previous auction prices for coins with similar conditions, we can see that:
- A coin with a condition of 85 sold for 180 euros in 2019.
- Another with a condition of 85 sold for 190 euros in 2022.
- A coin with a condition of 70 sold for 75 euros in 2018.

3. Average Auction Price: The average auction price for this coin is 196.53 euros, suggesting that, in general, coins of this reference tend to sell for relatively high prices.

4. Current Starting Price: The starting price is 120 euros, which is a good starting point, but since the average auction price is significantly higher, this suggests that there may be room for a higher purchase price.

5. Recent Trends: In the most recent auctions, the auction prices have been quite high, indicating increasing demand.

Based on these factors, an estimated maximum purchase price could be in the range of 200 to 250 euros, considering that the condition of 80 (VF+) is slightly lower than the higher conditions that have reached higher auction prices. Therefore, a reasonable maximum purchase price could be 240 euros.