To estimate a maximum purchase price for the coin in question, several factors must be considered, including the starting price, the condition of the coin, and the hammer prices of similar coins in the past.

### Relevant Data:
- Starting Price: 15 euros
- Condition of this Coin: 25 (BC)
- Previous Prices of this Coin:
- Coins with similar conditions (BC) have been sold in a price range that varies, but it is generally observed that hammer prices for coins in BC condition are significantly lower than for coins in better conditions.

### Analysis of Previous Prices:
- In previous auctions, hammer prices for coins in BC condition or similar have ranged between 20 and 60 euros, depending on demand and the rarity of the coin.
- Most coins in BC condition tend to sell in the lower price range, often below 50 euros.

### Maximum Price Estimation:
Given that the condition of the coin is 25 (BC), and considering the starting price of 15 euros, a reasonable maximum purchase price could be in the range of 30 to 50 euros. However, since the average hammer price for coins in similar conditions has been approximately 35-40 euros, an estimated maximum purchase price could be:

Estimated Maximum Purchase Price: 40 euros.

This price reflects a balance between the condition of the coin and the historical hammer prices for similar coins.

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

1. Condition of the coin: The coin has a condition rating of 95 (EBC+), indicating that it is in very good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Auction history:
- The average hammer price for similar coins has been 44.16 euros.
- In previous auctions, we have seen hammer prices that varied significantly, but some examples of coins with similar conditions have reached hammer prices of up to 160 euros (as seen in the auction on December 14, 2020).

3. Starting price and recent hammer prices:
- The current starting price is 18 euros, which is relatively low compared to previous hammer prices.
- The trend of hammer prices for coins of similar condition suggests that the price could be significantly higher.

4. Market trends: Since the coin has been auctioned 199 times and has had a high sales percentage (170 out of 199), this indicates a steady demand.

Based on these factors, an estimated maximum purchase price for this coin could be in the range of 150 to 200 euros. This is based on the historical hammer prices for coins of similar condition and market trends. However, the final price will depend on the competition in the auction and the willingness of other bidders.

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

1. Condition of the coin: The coin has a condition rating of 95 (EBC+), indicating that it is in very good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Auction history:
- The average hammer price for similar coins is 44.16 euros.
- In previous auctions, we have seen hammer prices that vary significantly, but some examples of coins with similar conditions have reached hammer prices of up to 160 euros (as seen in the auction on December 14, 2020).

3. Starting price and recent hammer prices:
- The current starting price is 18 euros, which is relatively low compared to previous hammer prices.
- The trend of hammer prices for coins of similar condition suggests that the price could be significantly higher.

4. Market trends: Since the coin has been auctioned 199 times and has had a high sales percentage (170 out of 199), this indicates a consistent demand.

Based on these factors, an estimated maximum purchase price for this coin could be in the range of 150 to 200 euros. This is based on the historical hammer prices for coins of similar condition and market trends. However, the final price will depend on the competition in the auction and the willingness of other bidders to pay.