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

1. Current Condition: The coin has a condition of 95 (EF+), which indicates that it is in very good shape. This generally translates to a higher price compared to coins in lower conditions.

2. Previous Prices: By looking at previous auction prices for coins with similar conditions (95), we can see that in recent auctions, the hammer prices have been:
- 1650 (2018, condition 95)
- 1800 (2018, condition 95)
- 2800 (2022, condition 95)
- 2800 (2023, condition 95)

3. Starting Price and Average Hammer Price: The current starting price is 1500 euros, and the average hammer price in the past has been 1460 euros. This suggests that the starting price is reasonable, but it also indicates that the hammer price could be higher depending on demand.

4. Auction Trends: The coin has been sold on all previous occasions, indicating consistent interest. Additionally, the fact that there have been no unsold coins in the past suggests that there is an active market for this coin.

5. Maximum Price Estimate: Given that the coin has a high condition and has reached hammer prices of up to 2800 euros in the past, a reasonable maximum purchase price could be in the range of 2500 to 2800 euros, considering that the starting price is 1500 euros and that interest in the coin may lead to competitive bidding.

Maximum Purchase Price Estimate: 2800 euros.