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

1. Current Condition: The coin has a condition rating of 70 (VF-), indicating that it is in an acceptable state, but not among the best qualities.

2. Auction History:
- The average hammer price for similar coins in the past is 139.48 euros.
- The coin has been auctioned 35 times, of which it has sold 32 times, indicating good demand.
- In previous auctions, the hammer price has varied, but there are examples of sales that have reached up to 240 euros for coins with similar conditions.

3. Starting and Hammer Prices:
- The current starting price is 150 euros, which is higher than the average starting price of 81.41 euros, suggesting that the seller has high expectations.
- In previous auctions, the hammer price has been significantly higher than the starting price, especially for coins in similar conditions.

4. Recent Trends: In the most recent auctions, hammer prices have shown an increase, which could indicate a rising trend in interest for this coin.

Based on these factors, an estimated maximum purchase price could be in the range of 180 to 240 euros, considering that the condition is acceptable and there is a history of hammer prices that supports this estimate. A price of 200 euros could be a reasonable starting point for an offer, given the auction history and current condition.