To estimate a maximum purchase price for the coin in question, we can analyze the provided data, especially the previous auction prices and the current condition of the coin.

1. Current condition: The coin has a condition of 70 (VF-). This indicates that it is in an acceptable state, but not of high quality.

2. Previous auction prices: By observing the auction prices of coins with similar conditions (70-85), we can see that:
- In several auctions, coins with a condition of 70 have reached auction prices between 120 and 150 euros.
- The general trend shows that the auction price tends to be higher than the starting price, suggesting that buyers are willing to pay more than the initial price.

3. Average auction price: The average auction price for this coin is 130.2 euros, which is also a good indicator of the expected value.

4. Analysis of recent auction prices: In the most recent auctions, the auction prices for coins with similar conditions have been:
- 120 euros (2022-10-18)
- 130 euros (2022-07-07)
- 170 euros (2023-03-16, but with a condition of 70)

5. Final estimation: Given that the condition of the coin is 70 and considering the previous auction prices, an estimated maximum purchase price could be around 150 euros. This is based on the fact that buyers have been willing to pay prices in that range for coins in similar conditions.

Therefore, the estimated maximum purchase price for this coin would be 150 euros.