Based on the provided data, we can observe that the coin has been auctioned four times before, with an average starting price of 83.75€ and an average closing price of 91.25€. The current condition of the coin is 70 (F-VF).

Additionally, the previous prices of this coin in previous auctions were as follows:

1. Auction on December 16, 2020:
- Starting price: 90€
- Estimated price: 150€
- Closing price: 90€
- Condition value: 70

2. Auction on March 14, 2019:
- Starting price: 125€
- Estimated price: 250€
- Closing price: 140€
- Condition value: 80

3. Auction on October 20, 2021:
- Estimated price: 150€
- Closing price: 100€
- Condition value: 70

4. Auction on February 16, 2023:
- Starting price: 30€
- Estimated price: 60€
- Closing price: 35€
- Condition value: 75

Given that the coin will be auctioned soon and its condition is 70 (F-VF), and considering the previous closing prices, we could estimate a maximum purchase price around 100-110€. It is important to note that the final price may vary depending on the demand at the auction and other external factors.