To estimate a maximum purchase price for the coin in question, we can consider several factors based on the provided data:

1. Current Condition: The coin has a condition rating of 80 (MBC+), indicating that it is in quite 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 94 euros.
- In previous auctions, we have seen hammer prices that varied significantly, but some have reached high figures, such as 320 euros in a recent auction with a condition of 75.
- The most recent auction (2023-03-16) had a hammer price of 280 euros with a condition of 85.

3. Starting Price and Average Starting Price:
- The current starting price is 40 euros, which is reasonable given the history of starting and hammer prices.
- The average starting price of 30.64 euros suggests that the current starting price is competitive.

4. Sales Trends: The coin has been sold in 12 out of 14 auctions, indicating good demand.

5. Estimation Based on Condition and Previous Prices: Given that the condition of the coin is better than many of the coins that have been sold in the past, and considering the higher hammer prices, we can estimate a maximum purchase price.

Taking all these factors into account, an estimated maximum purchase price for this coin could be between 150 and 200 euros. This is based on the history of hammer prices and the current condition, which is quite favorable.