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

1. Current Condition: The coin has a condition of 70 (MS-). This indicates that it is in an acceptable state, but not of high quality. Coins with a similar condition have had auction prices that vary, but are generally below those with a higher condition.

2. Previous Auction Prices: By observing the auction prices of coins with a similar condition (70), we find that they have reached auction prices of up to 300 euros in recent auctions. For example, at the auction on 2023-12-13, the coin with a condition of 70 was sold for 300 euros.

3. Average Auction Price: The average auction price for this coin is 416.09 euros, suggesting that, in general, coins of this reference tend to sell for higher prices, but this may be influenced by coins in better condition.

4. Starting Price: The current starting price is 125 euros, which is relatively low compared to previous auction prices.

5. Auction Trends: The coin has been auctioned 52 times, with a high percentage of sales (48 out of 52). This indicates a consistent interest in this coin, which may increase its value at auction.

Based on these factors, an estimated maximum purchase price for this coin could be in the range of 250 to 300 euros, considering that the condition is 70 and there have been recent sales in that range. This also takes into account the interest in the coin and the relatively low starting price.