To estimate a maximum purchase price for the coin to be auctioned, we can analyze the provided data, especially previous auction prices and the coin's condition.

1. Starting price: 1000 euros.
2. Auction history: The coin has been auctioned 58 times, of which it has sold 54 times. This indicates good demand.
3. Previous hammer prices: The hammer prices have varied considerably, with some reaching very high figures, such as 2500 euros in 2018, and others in the range of 180 to 650 euros in more recent auctions.
4. Condition: There is no information about the condition of this particular coin, which may complicate the estimation. However, it can be observed that coins with higher conditions (95 and 90) have reached significantly higher hammer prices.

Given that the starting price is 1000 euros, and considering that in the past hammer prices have reached up to 2500 euros, but there are also recent auctions where hammer prices have been lower, a maximum estimated purchase price could be set in a more conservative range.

Maximum purchase price estimation: Based on the history of hammer prices and the lack of information about the condition, a reasonable maximum purchase price could be between 1200 and 1500 euros. This allows for a margin for competition in the auction, but also considers the variability in previous hammer prices.