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 80 (MS+), indicating that it is in fairly good shape, but not the best possible condition.

2. Previous Prices:
- In previous auctions, the coin has had hammer prices that vary, but generally, the hammer prices have been around 1200 to 2400 euros, depending on the condition and demand at that time.
- The average hammer price in the past is 1327 euros, suggesting that this is a good reference point.

3. Current Starting Price: The starting price is 1300 euros, which is reasonable given the price history.

4. Recent Trends: In the most recent auction, the coin sold for 2002 euros with a condition of 85, indicating that there is growing interest in this coin.

5. Maximum Price Estimate: Given that the coin's condition is 80, which is lower than that of the most recent auction (85) and another auction (95), the hammer price could be slightly lower than 2002 euros, but still, it could be in a competitive range.

Taking all these factors into account, an estimated maximum purchase price for this coin could be between 1500 and 1800 euros. This would allow for competition in the auction without exceeding the historical hammer value for similar conditions.