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 a medium-low state of preservation. This generally affects the price, as coins in better condition tend to reach higher prices.

2. Auction History:
- The average hammer price for this coin in the past is 112.42 euros.
- The condition of coins auctioned in the past varies, but there are examples of coins with a condition of 75 that have sold for prices ranging from 45 to 65 euros.
- The last auction with a similar condition (75) had a hammer price of 65 euros.

3. Price Trends:
- Hammer prices have fluctuated, but there is a pattern that coins with a condition of 75 have reached hammer prices in the range of 55 to 70 euros in recent auctions.

4. Estimated Price:
- The estimated price for this coin in previous auctions has been between 50 to 100 euros, depending on the condition and demand.

Based on these factors, an estimated maximum purchase price for the coin with a condition of 75 could be around 70-80 euros. This is based on the auction price history and the current condition of the coin.