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 indicates that it is in an acceptable state, but not among the best qualities.

2. Starting Price: The starting price is 130 euros. This is a good starting point to understand the initial value.

3. Sales History:
- The average hammer price in previous auctions is 135.75 euros.
- The coin has been auctioned 111 times, of which it has sold 103 times, indicating good demand.
- In previous auctions, the hammer price has varied, but there are examples of hammer prices exceeding 200 euros in higher conditions.

4. Recent Trends: In the most recent auctions, hammer prices have ranged from 130 to 340 euros, depending on the condition.

5. Comparison with Previous Prices:
- In previous auctions with similar conditions (70-75), hammer prices have been around 110-150 euros.

Based on these factors, an estimated maximum purchase price for this coin could be between 150 and 180 euros, considering that the condition is a limiting factor and that the starting price is 130 euros. This allows for some margin for competition in the auction, but also reflects the historical interest and demand for the coin.

Therefore, a reasonable maximum purchase price could be 170 euros.