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

1. Current Condition: The coin is in a condition of 90 (EBC), indicating that it is in good shape.

2. Auction History:
- It has been auctioned 9 times in the past, of which it has sold 7 times.
- The average starting price in previous auctions is 86.1 euros, and the average hammer price is 116.68 euros.
- In previous auctions, the hammer price has varied, with a hammer price of 195 euros in a 2016 auction, indicating a high potential for sale.

3. Previous Auction Prices:
- In 2016, with a condition of 90, the hammer price was 73.23 euros.
- In 2022, with the same condition, the hammer price was 101.83 euros.
- In the most recent auction, the hammer price was 90 euros with a condition of 85.

4. Current Starting Price: The starting price is 60 euros, which is lower than the average starting price in previous auctions.

Based on this data, the maximum purchase price could be estimated by considering the average hammer price and the history of hammer prices for coins in similar conditions. Given that the average hammer price is 116.68 euros and considering that the condition is good, a reasonable maximum purchase price could be in the range of 100 to 120 euros.

Therefore, an estimated maximum purchase price could be around 110 euros. This allows for a margin for competition in the auction and aligns with previous hammer prices.