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

1. Starting price: 200 euros.
2. Coin condition: 70 (MBC-), indicating good condition, although not the best.
3. Auction history:
- In 2015, the coin was auctioned with a starting price of 250 euros and sold for 260 euros.
- In 2022, with a starting price of 60 euros, it sold for 380 euros, indicating strong interest in that auction.
- In another auction in 2022, with a starting price of 120 euros, it sold for 220 euros.
- In 2024, although the condition was very low (10), the final price was 950 euros, suggesting a strong market for this coin, regardless of its condition.

4. Average final price: 402 euros, indicating that, in general, coins of this reference tend to sell for higher prices than their starting price.

Given that the coin's condition is 70 (MBC-), which is quite good, and considering the auction price history, an estimated maximum purchase price could be set in a range between the average final price and a bit higher, given the demonstrated interest in previous auctions.

Estimated maximum purchase price: 450 euros.

This price reflects the good condition of the coin and market interest, but also considers that it is not the best possible condition.