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 95 (EF+), indicating that it is in very good shape. This generally translates to a higher price compared to coins with lower conditions.

2. Auction History:
- The average hammer price for similar coins has been 52.6 euros.
- In previous auctions, coins with a similar condition (95) have reached hammer prices that vary, but some examples are:
- 75 euros in December 2020.
- 55 euros in October 2020.
- 70 euros in May 2019.
- 120 euros in December 2019.

3. Starting Price and Average Starting Price: The current starting price is 30 euros, and the average starting price has been 37.23 euros. This suggests that the starting price is relatively low compared to the average hammer price.

4. Recent Trends: In the most recent auctions, the hammer price has shown a trend of being in the range of 50 to 120 euros for coins of similar condition.

Based on these factors, an estimated maximum purchase price could be in the range of 80 to 100 euros, considering that the condition is high and that the hammer price history for similar coins supports this estimate.

Therefore, a reasonable maximum purchase price could be 100 euros.