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

1. Coin Condition: The coin has a condition rating of 70 (MS-), indicating that it is in acceptable condition, but not among the highest quality.

2. Auction History:
- The average hammer price for similar coins has been 123.74 euros.
- In previous auctions, coins with a similar condition (70) have had hammer prices that varied, with some examples being:
- 120 euros (2020-10-20)
- 110 euros (2020-09-17)
- 130 euros (2021-04-20)
- 140 euros (2021-03-18)
- The current starting price is 60 euros, which is relatively low compared to previous hammer prices.

3. Sales Trends: The coin has been auctioned 91 times, of which 82 have resulted in sales. This indicates good demand and sustained interest in the coin.

4. Average Starting Price: The average starting price of 91.12 euros suggests that the current starting price of 60 euros is attractive and could draw in more bidders.

Based on these factors, an estimated maximum purchase price could be between 120 and 150 euros, considering that the condition is 70 and that interest in the coin appears to be strong. A hammer price of around 130 euros could be a reasonable target, given the sales history and the condition of the coin.