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

2. Auction History:
- The average hammer price for this coin in the past is 4632.75 euros.
- The coin has been auctioned 41 times, of which it has sold 37 times, indicating good demand.
- Previous hammer prices varied significantly, with some reaching very high figures (for example, 27394.88 euros in 2011).

3. Current Starting Price: The starting price is 750 euros, which may indicate an attractive initial price.

4. Comparison with Previous Prices:
- In previous auctions, coins with similar conditions (75) have reached hammer prices of around 1500 to 5400 euros.
- The last auction with a condition of 80 had a hammer price of 2500 euros.

Given all this, and considering that the condition of the coin is slightly lower than that of some of the more successful auctions, an estimated maximum purchase price could be in the range of 2000 to 3000 euros. This is based on the hammer price history and the current condition of the coin.

Therefore, an estimated maximum purchase price could be 2500 euros.