To estimate a maximum purchase price for the coin in question, we will consider several factors:

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

2. Starting Price and Average Hammer Price: The starting price is 130 euros, and the average hammer price in previous auctions is 183.72 euros. This suggests that, on average, similar coins have sold for a price higher than the starting price.

3. Sales History: The coin has been auctioned 99 times, of which 93 have resulted in sales. This indicates high demand and a good sales history.

4. Previous Prices: Looking at the hammer prices of coins with a similar condition (70), the hammer price has varied, but there are examples where they have sold for over 200 euros, such as in the auctions of 2020 and 2023.

5. Recent Trends: In the most recent auctions, the hammer prices for coins with a condition of 70 have been around 180-200 euros.

Based on these factors, an estimated maximum purchase price could be between 200 and 220 euros. This is because, although the condition is not the highest, the sales history and demand suggest that it could reach a price above the average hammer price.

Therefore, a reasonable maximum purchase price could be 210 euros.