To estimate a maximum purchase price for the coin in question, we can analyze 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 starting price from previous auctions is 710.51 euros, and the average hammer price is 1980.34 euros.
- In the past, coins with similar conditions (75) have been auctioned and have reached hammer prices that varied, but some examples are:
- 2014-02-08: Hammer price 553.62 euros (condition 75).
- 2014-11-01: No hammer price reported, but the starting price was 357.62 euros (condition 75).
- 2022-06-14: Hammer price 130 euros (condition 70).

3. Price Trends:
- The coin has had a range of hammer prices from low prices (like 130 euros) to higher prices (like 1545.61 euros in higher conditions).
- The general trend seems to indicate that coins with conditions of 75 can reach hammer prices in the range of 500 to 1500 euros, depending on demand and other market factors.

4. Current Starting Price: The starting price is 250 euros, which may attract some bidders, but given the history of hammer prices, it is likely that the final price will be significantly higher.

Based on these factors, an estimated maximum purchase price for this coin, considering its condition and auction history, could be in the range of 800 to 1200 euros. This reflects a balance between the current condition and previous hammer prices, taking into account that demand may influence the final outcome.