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

1. Current Condition: The coin has a condition rating of 80 (MBC+), which indicates 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 has been 86.89 euros.
- In previous auctions, coins with a similar condition (80) have reached hammer prices that vary, but some examples are:
- 80 euros in an auction with a starting price of 60 euros.
- 65 euros in another auction with a starting price of 60 euros.
- 150 euros in an auction with a starting price of 60 euros, but with a condition of 85.

3. Starting Price and Estimated Price:
- The starting price is 60 euros, and the estimated price is 110 euros. This suggests that there is potential for an increase in the hammer price.

4. Sales Trends: The coin has been auctioned 163 times, of which 144 have been successful sales. This indicates good demand and consistent interest in the coin.

5. Comparison with Previous Prices:
- In recent auctions, coins with a condition of 80 have reached hammer prices of up to 120 euros.

Based on these factors, an estimated maximum purchase price for this coin could be between 100 and 120 euros, considering that the average hammer price is 86.89 euros and that there is a history of higher prices for coins in similar conditions.

Therefore, a reasonable maximum purchase price could be 120 euros.