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

1. Current Condition: The coin has a condition of 95 (EF+), indicating that it is in very good shape. This generally increases its value compared to coins in lower conditions.

2. Previous Prices:
- In 2018, the coin was auctioned with a starting price of 150 euros and sold for 220 euros, with a condition of 95.
- In 2021, it sold for 140 euros with a condition of 95.
- In 2022, it sold for 150 euros with a condition of 70, indicating that condition significantly affects the price.

3. Average Hammer Price: The average hammer price for this coin is 184 euros, providing a good reference for the expected value.

4. Current Starting Price: The current starting price is 75 euros, which is quite low compared to previous prices.

5. Sales Trends: The coin has been auctioned 6 times, of which it has sold 5 times, indicating good demand.

Given all this, an estimated maximum purchase price could be in the range of 180 to 220 euros, considering that the condition is high and that previous prices have been consistent in that range. However, since the starting price is 75 euros, it could be a good opportunity to acquire it at a lower price, but the maximum you might consider to not exceed the market value would be around 200 euros.