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

1. Current Condition: The coin has a condition of 80 (VF+), which indicates that it is in relatively good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Auction History:
- The average hammer price in previous auctions is 35.38 euros.
- The average starting price is 36.73 euros.
- 37 out of the 69 coins auctioned have been sold, indicating a sell-through rate of 53.6%.

3. Previous Prices:
- In past auctions, hammer prices have varied significantly, with some reaching up to 110 euros in exceptional conditions (such as in 2022 with a condition of 95).
- The majority of hammer prices for similar conditions (75-85) have been in the range of 20 to 60 euros.

4. Recent Trends:
- In the most recent auctions, hammer prices have been in the range of 30 to 50 euros for similar conditions.

Based on these factors, an estimated maximum purchase price for the coin with a condition of 80 (VF+) could be in the range of 50 to 70 euros. This is based on the hammer price history and the current condition, which suggests that the coin has significant value but does not reach the highest levels of condition.

Therefore, a reasonable maximum purchase price could be 65 euros.