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 an acceptable state, but not of high quality.

2. Previous Prices:
- The average auction price for this coin in the past has been 132.58 euros.
- There are examples of auction prices in the past that varied significantly, ranging from 30 euros to 550.03 euros, depending on the condition and demand at that time.

3. Sales Trends:
- It has been auctioned 39 times, of which 32 have been sold, indicating a relatively high sell-through rate.
- The average starting price is 106.54 euros, suggesting that sellers are looking for reasonable prices.

4. Comparison with Similar Conditions:
- In previous auctions, coins with a condition rating of 75 have reached auction prices ranging from 60 to 160 euros.

5. Current Starting Price: The starting price is 100 euros, which may be a good starting point for the estimation.

Taking all these factors into account, an estimated maximum purchase price for this coin, considering its condition and previous auction prices, could be in the range of 150 to 180 euros. This is based on the price trends for coins in similar conditions and market interest.