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 among the best qualities.

2. Starting Price and Average Hammer Price: The starting price is 80 euros, and the average hammer price in previous auctions is 203.86 euros. This suggests that, in general, coins of this reference tend to sell for significantly higher prices than their starting price.

3. Sales History: The coin has been auctioned 32 times, of which it has sold 23 times. This indicates good demand and a relatively solid sales history.

4. Previous Prices: Looking at previous hammer prices for coins with a similar condition (75), the highest recorded price was 492.52 euros in 2013, although most hammer prices for similar conditions are in a lower range.

5. Recent Trends: In the most recent auctions, hammer prices have varied, but there are examples of coins with similar conditions that have sold for prices around 200-300 euros.

Based on these factors, an estimated maximum purchase price for this coin could be in the range of 200 to 250 euros, considering that the average hammer price is 203.86 euros and that the condition is acceptable. However, given the history of higher hammer prices, a maximum of 250 euros could be reasonable if one is looking to secure the purchase.