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

1. Current Condition: The coin has a condition of 70 (VF-). This is an important factor, as coins in better condition tend to reach higher prices.

2. Auction History:
- The average hammer price for similar coins in the past has been 83.17 euros.
- The last auction of this coin in 2023 had a hammer price of 45 euros with a condition of 75.
- In previous auctions, hammer prices have varied, but there are examples of sales above 100 euros for coins with similar conditions.

3. Starting Price: The current starting price is 50 euros, which may influence the final price, as hammer prices are usually above the starting price.

4. Price Trends: Observing previous hammer prices, there is a considerable range, but the trend seems to indicate that coins with a condition of 70 can reach hammer prices in the range of 70 to 100 euros, depending on demand at the auction.

Based on these factors, an estimated maximum purchase price for this coin could be between 90 and 110 euros, considering that the condition is good and there is a history of hammer prices that supports this estimate.

Therefore, a reasonable maximum purchase price could be 100 euros.

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

1. Coin Condition: The coin has a condition rating of 75 (MBC), indicating that it is in fairly good shape, but not of the highest quality (FDC).

2. Previous Auction Prices:
- The average hammer price for this coin has been 231.8 euros.
- In previous auctions, hammer prices for coins with a similar condition (75) have varied, but there are examples of hammer prices exceeding 200 euros.

3. Starting Price: The starting price is 100 euros, which may attract more bidders, but does not necessarily indicate the final hammer price.

4. Market Trends: Since the coin has been auctioned 525 times and has had a high sales percentage (471), this suggests there is consistent interest in this coin.

5. Comparison with Previous Prices: In past auctions, coins with a condition of 75 have reached hammer prices ranging from 95 to 320 euros, depending on demand and other factors.

Based on these points, an estimated maximum purchase price for this coin could be in the range of 250 to 300 euros. This is based on the average hammer price and the price trend for coins of similar condition.

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

1. Starting price: 200 euros.
2. Auction history: The coin has been auctioned 5 times, of which it has sold 4 times. This indicates a consistent interest in the coin.
3. Average starting and hammer price: The average starting price is 308.55 euros and the average hammer price is 504.78 euros. This suggests that, in general, coins of this reference tend to sell for a price higher than the starting price.
4. Condition: The condition of this coin is 70 (VF-), which is an important factor. Coins in better condition tend to reach higher prices.
5. Previous prices: Previous hammer prices varied, but the highest was 700 euros in 2017, indicating that there is significant potential to reach high prices depending on demand.

Given that the condition of this coin is 70, which is an acceptable but not excellent state, and considering the average hammer price of 504.78 euros, an estimated maximum purchase price could be set in a range between the average hammer price and a bit lower, since the condition is not the best.

Therefore, an estimated maximum purchase price could be around 450 euros. This reflects a balance between the historical interest in the coin and its current condition.