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

1. Current Condition: The coin has a condition of 75 (MBC), indicating that it is in fairly good shape, but not among the best qualities.

2. Historical Prices: Looking at previous auction prices for coins with a similar condition (75), we can see that they have reached auction prices that vary, but generally range between 120 and 190 euros. For example:
- In 2020, a coin with a condition of 75 was auctioned for 130 euros.
- In 2023, another coin with a condition of 75 was auctioned for 161 euros.

3. Average Auction Price: The average auction price for this coin is 132.6 euros, which provides a good reference.

4. Starting Price: The current starting price is 125 euros, suggesting that the auctioneer expects the coin to sell for a reasonable price.

5. Recent Trends: In the most recent auctions, the auction prices have shown a trend of being higher, especially for coins in good condition.

Based on these factors, an estimated maximum purchase price for this coin could be around 160 euros. This is based on the analysis of previous auction prices, the current condition, and the market context.