To estimate a maximum purchase price for the coin that is going to be auctioned, we can analyze the provided data, including previous auction prices and the general price trend.

1. Current starting price: 70 euros.
2. Average auction price in the past: 49.15 euros.
3. Previous auction prices:
- The coin has been auctioned with prices ranging from 8 euros to 200 euros, with several auction prices in the range of 10 to 120 euros.
- The highest recorded auction price was 200 euros in a previous auction.

4. Condition: There is no information about the condition of this coin, which may affect its value. However, it is noted that in previous auctions, coins with a condition of 95 have reached auction prices of up to 200 euros.

5. Trends: The coin has been auctioned 36 times, of which it has sold 34 times. This indicates good demand and consistent interest in the coin.

6. Comparison with previous prices:
- In recent auctions, the auction prices have been in a range of 20 to 70 euros, but there are also examples of higher auctions.
- The price trend seems to be increasing, especially for coins in better condition.

Given all this, an estimated maximum purchase price could be set at a higher range than the starting price, considering the possibility that the coin has significant value in the market.

Estimated maximum purchase price: 100 euros.

This price reflects a balance between the starting price, previous auction prices, and the demand observed in the market.