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 an acceptable state, but not among the best qualities.

2. Auction History:
- The average hammer price for similar coins has been 245.43 euros.
- In previous auctions, we have seen hammer prices that varied significantly, ranging from 50 euros to 1200 euros, depending on the condition and other factors.

3. Starting Price: The starting price is 80 euros, which may be a good indicator of the seller's expectations.

4. Price Trends: In recent auctions, coins with similar conditions have reached hammer prices ranging between 100 and 290 euros.

5. Analysis of Previous Prices:
- In auctions with conditions of 75, hammer prices have been around 60 to 360 euros.
- The most recent auction with a condition of 75 had a hammer price of 360 euros.

Based on this data, an estimated maximum purchase price for this coin could be in the range of 200 to 300 euros, considering that the condition is an important factor and that the average hammer price is significantly higher than the starting price.

Therefore, a reasonable maximum purchase price could be 250 euros.