To estimate a maximum purchase price for the coin in question, we will consider several factors:

1. Condition: The coin has a condition rating of 80 (MS+), indicating that it is in quite good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Starting Price: The starting price is 1500 euros, which is a good starting point for the estimation.

3. Auction History:
- The average hammer price in previous auctions is 1119 euros, suggesting that, in general, coins of this reference tend to sell below the starting price.
- However, there are examples of higher hammer prices, such as 1550 euros in a recent auction and 1500 euros in another.

4. Price Trends: In previous auctions, hammer prices have varied, but there is a trend for coins in good condition (like the one with a condition rating of 80) to sell at higher prices.

5. Proximity of Auctions: The coin will be auctioned in the coming days, which may influence demand and, therefore, the price.

Taking all these factors into account, an estimated maximum purchase price could be around 1600 euros. This price reflects the good condition of the coin and the hammer price history, as well as the possibility that demand in the current auction may be high.