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, but not among the highest qualities.

2. Auction History:
- The average hammer price for similar coins in the past has been 147.77 euros.
- Previous auctions of coins with similar conditions (around 75) have had hammer prices that varied, but some examples are:
- 2022-06-01: Hammer price 220 (condition 85)
- 2022-04-27: Hammer price 145 (condition 80)
- 2023-12-18: Hammer price 40 (condition 70)
- 2024-04-22: Hammer price 190 (condition 85)

3. Starting Price and Average Starting Price: The current starting price is 30 euros, and the average starting price for similar coins is 110 euros.

4. Sales Trends: The coin has been auctioned 47 times, of which 39 have been sold, indicating a good sales rate.

Based on this data, an estimated maximum purchase price could be in the range of 100 to 150 euros, considering that the condition is good but not excellent, and that the hammer price history for similar conditions has shown significant variations.

Therefore, a reasonable maximum purchase price could be 120 euros. This allows for a margin for competition in the auction and aligns with previous hammer prices for coins of similar condition.