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

1. Condition of the coin: The coin has a condition rating of 95 (EF+), indicating that it is in very good condition. This generally translates to a higher price compared to coins with lower conditions.

2. Auction history:
- The average hammer price for similar coins in EF+ condition has been approximately 43.87 euros.
- In previous auctions, we have seen hammer prices that vary, but some relevant examples are:
- 100 euros in an auction with a condition of 95.
- 70 euros in another auction with a condition of 95.
- 44 euros in an auction with a condition of 95.

3. Starting price and estimates:
- The current starting price is 30 euros, with an average starting price of 32.81 euros.
- The estimated price for this auction is 50 euros.

4. Sales trends: The coin has been auctioned 129 times, of which it has sold 106 times, indicating good demand.

Based on these factors, an estimated maximum purchase price could be between 70 and 100 euros, considering that the condition is high and there are precedents for sales in that range. However, since the starting price is 30 euros, it is likely that the hammer price will not significantly exceed 100 euros unless there is strong competition among bidders.

Therefore, a reasonable maximum purchase price could be between 80 and 100 euros.