To estimate a maximum purchase price for the coin in question, we will consider several factors, including the current condition of the coin, previous auction prices, and the average auction price.

1. Condition of the coin: The coin has a condition rating of 80 (VF+), indicating that it is in fairly good shape, but not of the highest quality (UNC).

2. Previous auction prices:
- In previous auctions, coins with a similar condition (80) have reached auction prices that vary considerably. For example, in a 2020 auction, a coin with a condition of 80 sold for 190 euros.
- There are also examples of coins with conditions of 85 and 90 that sold for prices around 50-100 euros.

3. Average auction price: The average auction price for this coin is 98.9 euros, which provides a good reference point.

4. Starting price: The starting price is 25 euros, suggesting that there is considerable room for the final auction price to be higher.

5. Market trends: Since the coin has been auctioned 1,295 times and has had a high number of sales (971), this indicates a consistent interest in this coin, which may influence the price.

### Estimation of the maximum purchase price:
Taking all these factors into account, a reasonable maximum purchase price for this coin could be in the range of 150 to 200 euros. This is based on the average auction price, the condition of the coin, and previous auction prices for coins of similar condition.

Therefore, if you are interested in acquiring this coin, you might consider setting a bidding limit in that range to ensure you do not exceed your budget.