To estimate a maximum purchase price for the coin in question, we can analyze the provided data, especially the previous auction prices and the current condition of the coin.

1. Current Condition: The coin has a condition of 75 (MBC), indicating that it is in an acceptable state, but not of the highest quality.

2. Previous Auction Prices:
- In previous auctions, we have seen hammer prices that varied significantly. For example:
- In 2014, a coin with a similar condition (75) was auctioned for 250 euros.
- In 2021, a coin with a condition of 90 was auctioned for 400 euros.
- In 2022, another coin with a condition of 85 was auctioned for 350 euros.
- In 2024, a coin with a condition of 75 was auctioned for 190 euros.

3. Price Trends:
- The average hammer price for similar coins seems to be in the range of 250 to 400 euros, depending on the condition.
- The coin in question has a starting price of 110 euros, suggesting that the seller expects moderate interest.

4. Estimation:
- Given that the condition is 75 and considering the previous auction prices, a reasonable maximum purchase price could be in the range of 250 to 300 euros. This is based on the fact that, although the condition is not the best, there is a history of prices suggesting that buyers are willing to pay more for coins in similar conditions.

Therefore, an estimated maximum purchase price for this coin could be approximately 300 euros.