To estimate a maximum purchase price for the coin in question, we can consider several factors based on the provided data:

1. Current Condition: The coin has a condition rating of 75 (MBC), indicating that it is in relatively good shape. This suggests that its value should be above the average for coins in worse conditions.

2. Auction History:
- The average hammer price for similar coins has been 113.46 euros.
- In previous auctions, coins with a similar condition (75) have reached hammer prices that varied, but some examples are:
- 110 euros (2019-03-14)
- 140 euros (2023-03-16)
- 110 euros (2023-01-31)
- The trend shows that coins in similar conditions have reached hammer prices ranging between 100 and 140 euros.

3. Starting Price and Average Starting Price:
- The current starting price is 60 euros, which is a good starting point, but the average starting price has been 63.06 euros, indicating that there may be room for the hammer price to be higher.

4. Demand and Sales Frequency:
- The coin has been auctioned 118 times, of which it has sold 103 times, indicating good demand and a history of successful sales.

Based on these factors, an estimated maximum purchase price for this coin could be between 120 and 140 euros, considering that the condition is good and there is a history of hammer prices that supports this estimate.

Therefore, a reasonable maximum purchase price could be 130 euros.