To estimate a maximum purchase price for the coin in question, we can analyze the provided data, including the starting price, the coin's condition, and previous auction prices.

1. Condition: The coin has a condition rating of 80 (MS+). This is an important factor, as coins in better condition tend to fetch higher prices.

2. Starting Price: The starting price is 1450 euros. This is the starting point for the auction.

3. Previous Auction Prices:
- The average hammer price for similar coins (with similar condition) is 1178.55 euros.
- Previous hammer prices for coins with a condition of 80 have varied, reaching up to 1400 euros in recent auctions.

4. Trends: Observing previous hammer prices, it seems that coins with a condition of 80 have had a hammer price range from 800 to 1400 euros, with an average around 1200 euros.

5. Estimation: Given that the starting price is 1450 euros, which is higher than the average previous hammer price, and considering that the condition is good (80), a reasonable maximum purchase price could be in the range of 1300 to 1450 euros, depending on the competition in the auction and the interest of collectors.

Conclusion: An estimated maximum purchase price for this coin could be approximately 1400 euros. This is based on the analysis of previous hammer prices and the condition of the coin.