To estimate a maximum purchase price for the coin in question, we can analyze the provided data, especially the previous auction prices and the current condition of the coin.

1. Current Condition: The coin has a condition of 80 (MBC+), indicating that it is in quite good shape.

2. Previous Auction Prices:
- In previous auctions, the coin has reached hammer prices that vary considerably. For example:
- 135 euros in 2020 with a condition of 80.
- 160 euros in 2019 with a condition of 80.
- 750 euros in 2018 with a condition of 85.
- 320 euros in 2014 with a condition of 75.
- 120 euros in 2022 with a condition of 70.

3. Average Hammer Price: The average hammer price is 197.69 euros, suggesting that, in general, coins of this reference tend to sell for relatively high prices.

4. Starting Price: The starting price is 60 euros, which is quite reasonable compared to previous hammer prices.

5. Sales Trends: The coin has been auctioned 14 times, of which 13 have sold, indicating good demand.

Based on these factors, an estimated maximum purchase price could be in the range of 150 to 200 euros, considering that the condition is good and that previous hammer prices have been significantly higher.

Therefore, a reasonable maximum purchase price could be 200 euros.