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

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

2. Auction History:
- The average hammer price for similar coins is 87.07 euros.
- In previous auctions, we have seen hammer prices that varied significantly, with a maximum of 200 euros in 2018 for a coin with a condition of 85.
- The last auction in 2024 showed a hammer price of 260 euros for a coin with a condition of 85, suggesting that prices may be on the rise.

3. Starting Price and Previous Sales:
- The current starting price is 60 euros, which is slightly higher than the average starting price of 51.67 euros.
- The coin has been sold in 29 out of 33 auctions, indicating good demand.

4. Recent Trends:
- In the most recent auctions, hammer prices have been quite high, suggesting that interest in this coin is increasing.

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 there is a history of hammer prices that supports this estimate. However, given the increasing interest and good condition, a price of up to 200 euros could be reasonable if one wishes to secure the purchase.