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 70 (MS-). This is an important factor, as coins in better condition tend to reach higher prices.

2. Previous Prices: By observing previous auction prices for coins with a similar condition (70), we can see that they have reached auction prices that vary, but generally range between 150 and 230 euros. For example:
- In the auction on February 16, 2023, a coin with a condition of 70 was sold for 230 euros.
- In other auctions, the hammer prices for similar conditions have been in the range of 150 to 200 euros.

3. Starting Price and Average Hammer Price: The current starting price is 150 euros, and the average hammer price for this coin is 190.06 euros. This suggests that the market is willing to pay more than the starting price.

4. Market Trends: The coin has been auctioned 55 times, with a sell-through rate of 98% (54 out of 55). This indicates strong demand.

5. Price Estimates: The estimated price for this coin is 200 euros, which is also a good indicator of its market value.

Based on these factors, an estimated maximum purchase price could be around 230 euros, which is the highest price reached in recent auctions for coins of similar condition. However, since the starting price is 150 euros, it is likely that buyers will be willing to bid more, especially if there is interest in the coin.

Estimated maximum purchase price: 230 euros.